REACTIONS OF ALIPHATIC DIAZO COMPOUNDS WITH ACETALS ORTHOCARBOXYLIC ACID ESTERS AND THEIR SULFUR ANALOGS UNDER LEWIS ACID CATALYSIS .7. SYNTHESES OF 3-SUBSTITUTED ISOCHROMANEDIONES FROM ORTHO-METHOXYCARBONYLDIAZOACETOPHENONE AND ORTHOCARBOXYLIC ACID ESTERS