Phosphoric Acid → HCID 18688937, compound

Participants

Reaction Steps

Toluene, 1000 milliliters (mL), heptanes, i.e., a C7 distillate having a boiling range of from 82 to 98° C., (1000 mL), methylene chloride (1000 mL), phosphoric acid, 20.0 grams of an 85 weight percent solution, 5.0 grams of hypophosphorus acid and 625.0 grams of 3-(ethoxycarbonyl)methoxycarbonyl-1-hydroxy-6-methylnaphthalene were added to a reaction flask. The reaction flask was a 5 liter four necked round bottom reactor equipped with an overhead mechanical stirrer, thermometer, electric heating mantle, heavier than water Barrett water trap, Fredrich's condenser and bottom outlet. The mixture was heated to reflux (~55° C.) and about 2 mL of water was removed. 1,1-Diphenyl-2-propyn-1-ol, 903.25 grams of a 61 weight percent solution in methylene chloride, was added to the reactor and the mixture was heated at reflux (~57° C.) for about 8 hours. The hot mixture was filtered to separate the insoluble desired product from the other products of reaction. The crystals were washed with 1 liter of a 1:1:2 mixture of toluene:heptanes:methylene chloride and dried to yield 144 grams of 2-diphenylmethyl-6-hydroxy-9-methyl-4-oxo-4H-naphtho[2,1-c]pyran.

Provenance & Evidence