Preparation and crystal structure of spiro(5,7-dimethoxy-1(1H)oxo-2-benzopyran-3(4H),1′-cyclohexane)

Crystal Structure and Synthesis of 3-Benzyl-3-phenyl-3,4-dihydroisocoumarin

“…The bond distances and bond angles for both asymmetric molecules, A and B, are in good agreement with a related 3,4dihydroisocoumarin. 3 A widening of the angle O1-C1-C8a is observed in both molecules, and the large value of this angle is attributed to lone-pair interactions between O1 and O2. In both molecules, the heterocyclic ring B exists in a half-chair conformation, with the rotational axis passing through the C1-C8a and C3- Table 3 .…”

Crystal Structure of 2-phenylpyrazolo[4,3-c]coumarin

“…isocoumarins, had already been studied by us. [3][4][5] In a 50 mL round-bottom flask fitted with a reflux condenser and a guard tube, a mixture of 1-phenyl-3-(2methoxyphenyl)pyrazole-4-carboxylic acid (0.01 mol) and anhydrous pyridine hydrochloride (0.03 mol) was heated at 200˚C in a paraffin bath for four hours. The reaction mixture was allowed to come to room temperature, and was then treated with cold water (30 mL).…”