Synthesis of 9,10-phenanthrenequinone and 9-methoxyphenanthrene by oxidation of phenanthrene with dihydroxy phenylselenonium benzenesulfonate
9,10-Phenanthrenequinone is prepared by oxidation of phenanthrene with dihydroxy phenylselenonium benzenesulfonate in boiling dioxane-water. 9-methoxyphenanthrene is obtained when the reaction is carried out in methanol.
New Methods and Reagents in Organic Synthesis. 18. Homologation of Ketones with Trimethylsilyldiazomethane (TMSCHN2)
Trimethylsilyldiazomethane (TMSCHN2) easily reacts with various ketones in the presence of boron trifluoride etherate in methylene chloride solution to give chain- or ring-homologated ketones, and can be used as a stable and safe substitute for hazardous diazomethane.The reaction proceeds below 0 deg C during 1-4 h, and permits much more efficient homologation than can be achieved with diazomethane.
NEW METHODS AND REAGENTS IN ORGANIC SYNTHESIS. 10. TRIMETHYLSILYLDIAZOMETHANE (TMSCHN2), A NEW, STABLE, AND SAFE REAGENT FOR THE HOMOLOGATION OF KETONES
Homologation of ketones can be achieved with trimethylsilyldiazomethane (TMSCHN2) which is a stable and safe substitute for hazardous diazomethane.