Yg. Gololobov et al., NOVEL REACTION OF ISO(THIO)CYANATES - INSERTION REACTION OF ISO(THIO)CYANATES INTO C-C BOND, Tetrahedron letters, 38(42), 1997, pp. 7437-7440
Interaction of zwitter-ions 1 with arylisocyanates (a-e) and phenyliso
thiocyanate leads to the stable zwitter-ions 3(a-e) and 4 which probab
ly represent rearrangement products of the initially formed adducts 2.
The molecular structure of compounds 4 was confirmed by X-ray diffrac
tion study. The formation of zwitter-ions 3 and 4 is a result of the i
nsertion of iso(thio)cyanates into the C-C bond of the starting zwitte
r-ion 1, under the action of the positively charged phosphorus atom (i
ntramolecular electrophilic catalysis). (C) 1997 Elsevier Science Ltd.