Table 2.

Reduction of xanthate 1a in the presence of deuterated O-ethyl S-ethyl dithiocarbonates 3–5 in C₆H₆.

Entrya	Xanthate	Additive (1 equiv)	Et3B (eq)b	Yield % 1b + 1c	Yield % 1a	D%
1	1a	3	5	40	55	<1
2	1a	4	5	36	58	<1
3	1a	5	5	37	58	<1

^a Reactions performed in Teflon "glassware" using 0.312 mmol of xanthate 1a. ^b Freshly prepared 1 M solutions of pure Et₃B in C₆H₆ were used.