The cc-oxoketene dithioacetal functionality may be viewed as either a P-ketoester containing a protected ester moiety or as ... Published on 01 January 1983. Downloaded by google on 20/02/2016 07:51:00. ... View Article Online / Journal Homepage / Table of Contents for this issue ... R' MeS R' (la-c 1 (2a-d) ... Base Solvent LHMDS THFC LDA LHMDS LDA Et20 Et2NLi THF LHMDS ... 25 40 27 43 19 25 35 32 -78toO 52 15 45 12 17 16 0 22 25 Od 19