146287-15-2

Upstream product

• 71638-08-9 1-(diphenylphosphinoyl)imidazole 
• 513-42-8 3-hydroxy-2-methyl-1-propene 
• 138905-51-8 C₁₉H₁₇O₃PS 
• 1499-21-4 Diphenylphosphinic chloride 

Relevant academic research and scientific papers

A synthesis of allylic diphenylphosphinic esters

The preparation of diphenylphosphinate esters of allylic alcohols is reported. Addition of allylic alcohols to the imidazolinium salt prepared in situ from diphenylphosphinic chloride and imidazole or to 1-(diphenylphosphinoyl)imidazole produces the corre

Intramolecular Ene Reactions of Thioaldehydes Giving α-Mercapto Lactones

The crystalline acids 3b, 4b and 5b and 6b, formally cycloadducts of anthracene, 9,10-dimethylanthracene and cyclopentadiene, respectively, with thioxoacetic acid (HO2CCHS), have been used to prepare esters with various allylic and homoallylic alcohols.These esters dissociated when heated, either in toluene under reflux or under the conditions of flash vacuum pyrolysis (FVP), to liberate transient thioaldehydes (thioxoacetate esters), which underwent intramolecular 'ene' reactions.Thus, the anthracene derivative 3c, in toluene at 111 deg C gave, via prenyl thioxoacetate 2c, cis-2-mercapto-3-isopropenylbutyrolactone 13 in good yield.The corresponding cyclopentadiene derivatives 5c and 6c gave the same product, as a mixture of cis and trans isomers, essentially quantitatively when subjected to FVP.Similar experiments, involving Type intramolecular ene reactions, gave the α-mercapto-γ-lactones 20, 21 and 22, and the epimeric α-mercapto-δ-lactones 26.Further, the cyclopentadiene adduct 6h of 2-methylprop-2-enyl thioxoacetate 2h gave, under FVP conditons, the α-mercapto-δ-lactone 27 by a Type ene reaction.Evidence supporting a concerted mechanism for the ene reactions is discussed.Improved preparations of the cycloadducts 3b and 4b of thioxoacetic acid 2b with anthracene nad dimethylanthracene, respectively, are recorded.