{"product_id":"new-synthesis-of-triarylmethanes-pyranones-indoles-and-pyrroles-von-rasheed-ahmad-und-peter-langer","title":"New synthesis of Triarylmethanes, Pyranones, Indoles and Pyrroles","description":"\u003cp\u003eDianions and masked dianions represent important building blocks for the regioselective formation of carbon-carbon bonds. Cyclocondensation reactions of 1,3-bis(silyl enol ethers) with different mono(silyl enol ethers) provide an elegant approach for the synthesis of various complex carba- and heterocycles from simple starting materials. A variety of functionalized and sterically encumbered triarylmethanes were prepared by combination of FeCl3-catalyzed benzylations of 1,3-diketones and formal [3+3] cyclocondensation reactions of 1,3-bis(silyl enol ethers) and 3-benzyl-1-silyloxy-1-en-3-ones. Subsequently, 4-methoxy-, 4-chloro and 4-flulro-substituted triarylmethanes are prepared The products are not readily available by other methods. In addition, functionalized diarylmethanes have been also prepared by cyclocondensation of 1.3-bis(silyl enol ethers) with with respective 3-benzyl-1-silyloxy-1-en-3-ones. Further more, dianions were converted to useful cyclic structure of pyranones with functionalized benzaldehydes providing a new strategy. Varius pyranones were synthecized containing 3-bromo-, 4-Methyl-, 4Phenyl-, 4-methoxy- and 4-hydoxy-phenyle groups.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783847339632\"\u003e\u003ch3\u003eCyclization reactions at their best\u003c\/h3\u003e\u003c\/div\u003e","brand":"Autorenwelt Shop","offers":[{"title":"Softcover - 9783847339632","offer_id":39493494407261,"sku":"9783847339632","price":49.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/e74d1c44-3841-4bbb-821f-2c71e1144697.jpg?v=1769667912","url":"https:\/\/shop.autorenwelt.de\/products\/new-synthesis-of-triarylmethanes-pyranones-indoles-and-pyrroles-von-rasheed-ahmad-und-peter-langer","provider":"Autorenwelt Shop","version":"1.0","type":"link"}