Page 1. SYNTHETIC COMMUNICATIONS, 16(11), 1439-1450 (1986) ... for 6 hours at room temperature (in the ca8e of thio- compound 16 hours at 40 OC). The reaction mixture was ... der Organischen Chemie", Houben-Weyl, Vol. XII/2, Ed. Miiller, E., Thieme Verlag, Stuttgart, 1964, ...