Sulphenes with imines

Cycloaddition of diphenylisobenzofurans to (101), to sulphenes, to 2-phenyl-3-spirocyclopropylazirines, and to o-benzoquinonedi-imines have been reported. The preparation and trapping of 1-methoxy- and 1-benzyl-isobenzofuran have been described and a high degree of regio-and stereo-specificity is observed in the reactions of a range of 1-substituted isobenzofurans with quinone acetals, for example in the formation of... 

It also participates in dipolar cycloaddition reactions, for example with diazo-compounds [221], nitrile oxides [222], nitril-imines [223] and sulphenes [224]. A mixture of products may be isolated including rearrangement products from the original adducts. 

Classically, imines have been obtained via derivatisation of carbonyl compounds although problems exist in the use of unreactive carbonyl compounds and/or volatile imines. This transformation has nevertheless been achieved in excellent yields in the absence of solvent merely by treating carbonyl compounds dispersed on alumina with amines that have been similarly dispersed on alumina, Trimethylsily1 trifluoromethanesulphonate has been found to catalyse formation of imines from carbonyl compounds and 1,N-bis-(trimethysilyl )amines, these reactions also proceeding in excellent yield.The same research group also discovered that sulphen-imines could be isolated from reactions between tJ-bis (trimethyl-... 

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