No abstract

Addition reactions of secondary and tertiary silylamines and of silazanes with isocyanates were studied. Spectroscopic Silylureas Reactions Isothiocyanates and silylamines Silylamine-isocyanate adducts ( 1 : 1) were obtained with secondary and tertiary silylamines. evidence favors N-silylurea structures for these thermally stable, hydrolytically sensitive adducts. containing a t least one proton on nitrogen were found to undergo a rapid silyl-proton exchange. of disilazanes with isocyanates led to disilyl-substituted ureas and biurets. formed analogous adducts which reverted to the starting materials a t elevated temperatures.

No abstract

Manganese autoxidations are often carried out in acetic acid solutions. It has been shown that acetic acid is oxidized to an electrophilic species under these conditions and a variety of products are produced from reaction of this species with various substrates. A study of the products arising from four classes of compounds has been carried out. Although this electrophilic species undoubtedly occurs in manganese autoxidations, it is unlikely that it enters directly into the normal autoxidation sequence.