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C 11 H 13 NO 4 S, orthorhombic, P2 1 2 1 2 1 (no. 19), a =5.7011(4) Å, b =8.9203(6) Å, c =23.571(2) Å, Source of material The preparation was carried out under nitrogen atmosphere at -10 .°Cb ya dding 3.3 mmol (0.57 g) diethyl azodicarboxylate (DEAD) to asolution of 3.3 mmol (0.866 g) triphenylphosphine in 6mldry ethyl acetate . After stirring for 15 min the betaine complex  was formed (monitored by GC). Then 3m mol (0.816 .g) N-tosyl-2-methylserine was added, the reaction mixture wasdoi:10.1524/ncrs.2010.0058 fatcat:jp5zdxwpwzhirnvxejdhkfiiru