Naturally occurring prostaglandins contain a cyclopentane ring, a trans double bond between C-13 and C-14, and a hydroxyl group at C-15. The letters following the abbreviation PG indicate the nature and location of the oxygen-containing substituents present in the cyclopentane ring. Letters are ...
Adsorption of NO2 and the retention of NO (the product of NO2 reduction by carbon) on the materials prepared from iron acetato complex and its mixture with... Svetlana,Bashkova,Teresa,... - 《Ind.eng.chem.res》 被引量: 77发表: 2009年 Oxygen and nitrogen heterocycles by intramolecular ...
yl or 5-oxo-4H-1,2,4-oxadiazol-3-yl; and A is a group which together with the adjacent carbon-carbon double bond forms a heteroaromatic ring containing from 1 to 4 heteroatoms selected from nitrogen, oxygen and sulfur and optionally substituted. SHEJR. LYNCH JOSEPH J....
These compounds arise from removal of one of the terminal hydroxyl groups and its replacement with a hydrogen atom. To simplify the synthesis, an oxygen atom linked to the aromatic ring is used in the common scaffold. The simpler members of this series are represented by both enantiomers of ...
XPS analysis found that high–energy particles irradiation in vacuum like EL did not lead to the formation of any new bond and only resulted in some atomic–scale defects in graphene layers, but strong oxidizing AO could react with C atoms and generate carbon–oxygen compounds like CO2 which ...
oftrialkylsilanestocarbonÃ/oxygendoublebondsbutis alsoeffectiveforthereductionofacetalsandsilane- inducedring-openingreductionofcyclicethers[2].The silane-inducedringopeningpolymerizationcatalyzedby 1isarareexampleofthetransitionmetal-catalyzed productionofpolyalkyleneoxides;ashortpaper appearingin1970reportedthatCo...
or CR4 together with an adjacent carbon atom of A or B forms a double bond; R5 is a halogen atom or an alkyl, alkoxy or halogenalkyl radical of 1 to 3 carbon atoms, and n is 0, 1 or 2; which compound bears 0 or 1 alkyl substituent of 1 to 4 carbon atoms on the trimethylene...
or CR4 together with an adjacent carbon atom of A or B forms a double bond; R5 is a halogen atom or an alkyl, alkoxy or halogenalkyl radical of 1 to 3 carbon atoms, and n is 0, 1 or 2; which compound bears 0 or 1 alkyl substituent of 1 to 4 carbon atoms on the trimethylene...
with 1-10 atoms of C, in which two adjacent C atoms can form a double bond and / or one or two non-adjacent CH and / or CH2 groups can be replaced by N-, O- and / or S atoms and wherein 1-7 H atoms can be replaced by R5, Cyc denotes cycloalkyl with 3-7 C atoms, ...
Similarly, tetrahydrofuran is puckered with the C2-symmetrical T form (the envelope conformation with a flap oxygen) being the lowest in energy. Both pseudorotational and inversion barriers are small (0.22 cal mol− 1 and 4.15 mol− 1, respectively).55 Also, pyrrolidine is found to undergo...