The reaction temperature is usually, but not limited to, about 20??? C. to 50??? C. The reaction may be conducted for, usually, 30 minutes to 10 hours and preferably 1 to 24 hours. [0127] The reaction can be advantageously carried out in the presence of a base including, for instance, an alkali metal hydride such as sodium hydride and potassium hydride; alkali metal carbonates such as sodium carbo