Abstract: This invention relates to an improved method of making sulfonyl isocyanates from the corresponding sulfonamides and phosgene.

Abstract: A process for the preparation of 2-carboalkoxy-1-indanones of Formula I from 1-indanones of Formula II using a dialkyl carbonate and an alkali metal alkoxide is provided. This process is superior to the prior art in that it avoids pyrophoric reagents such as sodium hydride, and proceeds in high chemical yield and product quality. The invention provides a novel process to an important intermediate in the preparation of arthropodicidal carboxanilides of commercial interest. ##STR1## wherein: R.sup.1, R.sup.2 and M are defined in the specification.