- Generation, stability, dimerization, and Diels-Alder reactions of masked o-benzoquinones. Synthesis of substituted bicyclo[2.2.2]octenones from 2- methoxyphenols
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Diels-Alder reactions of labile and readily dimerizing masked o- benzoquinones, i.e., substituted 6,6-dimethoxy-2,4-cyclohexadienones with electron-deficient dienophiles that resulted in the development of an efficient and reliable one-pot method for the
- Liao, Chun-Chen,Chu, Chrong-Shyua,Lee, Tsung-Ho,Rao, Polisetti Dharma,Ko, San,Song, Ling-Duan,Shiao, Huey-Chin
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- Formation of dioxolane on the surface of silica-sulphuric acid in dry media - Chemoselective protection of aryl aldehydes
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Chemoselective protection of aryl aldehydes can be accomplished through the formation of dioxolane on the surface of silica-sulphuric acid under solvent-free conditions where aliphatic aldehydes, dialkyl ketones, aryl alkyl ketones, and diaryl ketones rem
- Saha, Manabendra,Roy, Sanchita,Chaudhuri, Subrata Kumar,Bhar, Sanjay
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p. 1989 - 1993
(2008/02/04)
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- VANILLIN ACETALS AND SENSORY STIMULANT COMPOSITION CONTAINING THE SAME
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The invention relates to a sensory stimulant composition containing one or more of vanillin acetals represented by the general formula (1), and a flavor and fragrance composition, a beverage or food product, a fragrance or cosmetic product, a daily utensil product, an oral composition, or a pharmaceutical product containing the sensory stimulant composition with a warming sensation agent or cooling sensation substance, if necessary. Vanillin acetals represented by the general formula (1) show an excellent pungent and/or warming sensation effect and a cooling sensation-emphasizing effect.
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Page/Page column 36; 39
(2008/06/13)
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- Polyaniline-Supported Sulfuric Acid Salt as a Powerful Catalyst for the Protection and Deprotection of Carbonyl Compounds
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Structurally different carbonyl compounds were converted into their corresponding cyclic acetals using polyaniline-sulfate salt as catalyst in dry toluene in excellent yield. In turn, useful deacetalization in aqueous medium was demonstrated. Chemoselective protection of carbonyl compounds was also demonstrated. The advantages of the polyaniline-sulfate salt are ease of preparation and handling, stability, reusability and activity.
- Palaniappan, Srinivasan,Narender, Puli,Saravanan, Chandrasekaran,Rao, Vaidya Jayathirtha
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p. 1793 - 1796
(2007/10/03)
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