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Less explored are complementary or reverse transformations within the P(III)/P(V) interconversion network. This work introduces two new pathways: a P–C bond-forming method enabling conversion among symmetrical phosphine oxides and formation of P-stereogenic oxides and quaternary phosphonium salts, and a methoxymethyl-substituted QPS cleavage route that accomplishes dequaternization to access mixed-substituent tertiary phosphines from triphenylphosphine.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/the-organophosphorus-synthesis-triangle-introducing-methods-for-the-missing-quaternization-and-de-quaternization-routes/450017/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/the-organophosphorus-synthesis-triangle-introducing-methods-for-the-missing-quaternization-and-de-quaternization-routes/450017.png","ImageObject",300,407,{"name":92,"@type":93},"Logic","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-06","2026-09-30",true,{"@type":102,"interactionType":103,"userInteractionCount":19},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does the “P-triangle” describe in organophosphorus synthesis?","Question",{"text":112,"@type":113},"It summarizes historical synthetic development around three interrelated organophosphorus motifs: P(III) derivatives, their P(V) quaternized forms, and their oxidized/phosphine oxide-type derivatives, with defined transformation connections between classes.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does the first new pathway expand synthesis of P(III)/P(V) derivatives?",{"text":117,"@type":113},"It uses a P–C bond-forming process to interconvert symmetrical phosphine oxides into P-stereogenic phosphine oxides and quaternary phosphonium salts.",{"name":119,"@type":110,"acceptedAnswer":120},"What is the role of methoxymethyl (MOM) quaternary phosphonium salts in the second pathway?",{"text":121,"@type":113},"These salts undergo P–C bond cleavage to achieve dequaternization, enabling the synthesis of mixed-substituent tertiary phosphines from triphenylphosphine.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},450017,1791097774,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":19,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},1099513958762,"https://ap-avatar.wpscdn.com/avatar/1000023916a998db790?x-image-process=image/resize,m_fixed,w_180,h_180&k=1784791008015729253","Chemical Science  \n[rsc.li/chemical-science](rsc.li/chemical-science)  \nISSN 2041-6539  \nEDGE ARTICLE  \nKirill Nikitin, Declan G. Gil heany et al. The organophosphorus synthesis triangle: introducing methods for the missing quaternization and  \nde-quaternization routes  \nChemical Science  \nEDGE ARTICLE  \nCite this: Chem. Sci., 2026, 17, 164  \nAll publication charges for this article have been paid for by the Royal Society of Chemistry  \nReceived 18th June 2025 Accepted 13th October 2025 DOI: 10.1039/d5sc04496k[rsc.li/chemical-science](rsc.li/chemical-science)  \nThe organophosphorus synthesis triangle: introducing methods for the missing quaternization and de-quaternization routes  \nAnna C. Vetter,  Yannick Ortin,  Kirill Nikitin  * and Declan G. Gilheany  *  \nIn organophosphorus chemistry, several established reactions, such as the conversion of phosphorus trichloride into tertiary phosphines, followed by oxidation and quaternization to form phosphine oxidesand phosphonium salts, are widely recognized and routinely applied. In contrast, other potentially valuable transformations, including reverse or complementary versions of these standard synthetic routes, remain largely unexplored or technically challenging. This work introduces two new reaction pathways that broaden the scope of organophosphorus synthesis. The first involves a P–C bond-forming process that enables interconversion of symmetrical phosphine oxides, such as triphenylphosphine oxide (Ph3 PO), into P-stereogenic phosphine oxides and quaternary phosphonium salts. The second transformation is based on the distinctive reactivity of methoxymethyl (MOM)-substituted quaternary phosphonium salts. These compounds undergo a P–C bond cleavage reaction that results in dequaternization, allowing the synthesis of mixed-substituent tertiary phosphines from triphenylphosphine as a common precursor. Together, these two processes provide multiple efficient synthetic routes to phosphines, phosphine oxides, and quaternary phosphonium salts. The overall synthetic approach is flexible, so that the target compounds can be obtained through several pathways using different substituent combinations as starting materials.  \nIntroduction  \nIn the context of the importance of phosphorus compounds in Nature, industrial materials and synthesis,1 the synthetic chemistry of organophosphorus compounds assumed a standing from the earliest days of organic synthesis2 and today is explored extensively.3 However, despite all of that activity, there are still a few basic interconversions that are difficult or impossible to achieve and some phosphorus substitution patterns that are inaccessible. To illustrate the issues, we introduce here the Organophosphorus Synthesis Triangle (or Ptriangle, Scheme 1) . This re􀀁ects that, historically, organophosphorus synthesis developed around a trio of key molecular motifs: P(III) compounds 1 and their P(V) quaternized, 2, and oxidized derivatives, 3 (Scheme 1) .2b,3df, Structure 1 is represented largely by tertiary phosphines R3P but also includes halophosphines and certain P–O structures: for example phosphonous acid derivatives (R = organic group, Y = leaving group, e.g. alkoxy, halide) . Similarly, structure 3 describes both phosphine oxides (PO) and phosphon(in)ic acid derivatives. Structure 2 is mostly associated with quaternary phosphonium salts,(QPS, R = organic group) but also encompasses their oxo- and halo-analogues. The interconnectivity, both between 1–3  \nSchool of Chemistry, University College Dublin, Bel􀀁eld, Dublin 4, Ireland. E-mail: [kirill.nikitin@ucd.ie](kirill.nikitin@ucd.ie); [declan.gilheany@ucd.ie](declan.gilheany@ucd.ie)  \n(transformations A–C) and within these three classes (replacing Y with an organic R, transformations D–F), has served many lines of synthetic chemistry in accessing, for example: important building blocks in organic synthesis,4 indispensable  \nScheme 1 The “P-triangle” interconnects P(III) and P(V) derivatives: 1 (e.g. phosphi","cbCaibnScMLyNyTa","https://ap.wps.com/l/cbCaibnScMLyNyTa","pdf",1900079,13,"English","# Introduction\n## The P-triangle concept and key motifs\n## Interconnectivity and standard transformations\n## Practical caveats in P-triangle implementation","[{\"question\":\"What does the “P-triangle” describe in organophosphorus synthesis?\",\"answer\":\"It summarizes historical synthetic development around three interrelated organophosphorus motifs: P(III) derivatives, their P(V) quaternized forms, and their oxidized/phosphine oxide-type derivatives, with defined transformation connections between classes.\"},{\"question\":\"How does the first new pathway expand synthesis of P(III)/P(V) derivatives?\",\"answer\":\"It uses a P–C bond-forming process to interconvert symmetrical phosphine oxides into P-stereogenic phosphine oxides and quaternary phosphonium salts.\"},{\"question\":\"What is the role of methoxymethyl (MOM) quaternary phosphonium salts in the second pathway?\",\"answer\":\"These salts undergo P–C bond cleavage to achieve dequaternization, enabling the synthesis of mixed-substituent tertiary phosphines from triphenylphosphine.\"}]","The organophosphorus synthesis triangle - introducing methods for the missing quaternization and de-quaternization routes | PDF",1790731834,33]