450 Ja´szay et al.
ACKNOWLEDGMENT
The authors wish to thank Prof. Gy. Keglevich for
helpful suggestions.
SCHEME 3
REFERENCES
from the solvent given in Table 1. All compounds are
known from the literature. The details can be seen in
Table 1.
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General Procedure for the Preparation
of Carboxylic Anhydrides 6
A mixture of carboxylic acid chloride 8 (10 mmol),
dry K2CO3 (5.53 g, 40 mmol), TEBAC (0.22 g,
1.0 mmol), and toluene (20 mL), was stirred at re-
flux temperature for the time given in Table 2. The
solid was filtered off and washed with toluene (5 mL).
The solvent was evaporated and the residue crystal-
lized or distilled. All compounds are known from the
literature. The details can be seen in Table 2.
Monitoring the Transformation of the Sulfonyl
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