3‐Alkyl‐1‐Alkynes Synthesis: 3‐Ethyl‐1‐Hexyne

Abstract

3‐Alkyl‐1‐alkynes synthesis: 3‐ethyl‐1‐hexyne solvent: 400 ml. of pure, dry pentane product: 3‐ethyl‐1‐hexyne product: 3‐ethylhexane

Microwave-assisted synthesis of xanthones promoted by ytterbium triflate

“…10 Xanthones are usually synthesized using benzophenones or diaryl ethers as starting materials under harsh reaction conditions and often in the presence of strong acids or toxic metals as catalysts, but generally providing the desired products in low yields. [11][12][13][14][15][16][17] Improvements have been achieved applying microwave irradiation especially in terms of yields and shorter reaction times. 18,19 Unfortunately many of these processes suffer major or minor limitations such as severe reaction conditions, low yields, tedious work-up procedures, lack of regiochemical control in the ring closure step, co-occurrence of several side reactions, and need of chromatography for purification of adducts.…”