Studies the potentials of the fluorine atom as a cation-stabilizing auxiliary in biomimetic polyene cyclizations. Total synthesis of dl-beta-amyrin; Preparation of polyene through stereoselective methods; Optimum conditions for cyclization of cyclopentenol; Establishment of identity of dl-beta-amyrin....
FLUORINE ATOM-CONTAINING POLYFUNCTIONAL OXETANE CO 优质文献 相似文献A Novel Thermal Curing Reaction of Oxetane Resin with Active Diester Thermal curing reactions of oxetane resins {mixtures of novolac type oxetane (PNOX) with 2,2′-bis{(3-ethyl-3-oxetanyl)methoxy}biphenyl (2,2′-BPOX) and mi...
Because the fluorine atom has only nine electrons, which are close to the nucleus, thepositive nucleus has a strong tendency to gain electrons to complete its outer shell. As a gasits density (specific gravity) is 1.695, and as a liquid, its density is 1.108. Its freezing point is–219.61...
Adding chemistry's most electronegative atom to porous polymer networks may lead to gas-specific filters capable of flexible ‘breathing’. The tunable activity of metal–organic frameworks towards specific guest molecules, such as drugs or pollutants, has led to a flurry of recent research reports....
PURPOSE:To obtain a stabilized azeotropic composition capable of exhibiting inhibitory effects on metal corrosion and high stabilizing effects by adding nitro compounds, etc., used as a stabilizer to an azeotropic composition composed of methanol, etc., and specific fluorocarbon-based compound and stabil...
Single-atom catalytic growth of crystals using graphene as a case study Article Open access 03 December 2021 Water induced ultrathin Mo2C nanosheets with high-density grain boundaries for enhanced hydrogen evolution Article Open access 24 November 2022 Data availability The data supporting the fin...
13Elemental Fluorine 5.1 Chemical Properties Fluorine is an almost colourless gas. ln dense concentrations and in the liquid state it is seen to have a pale greenish yellow colour. lt has a characteristic odour, similar to a mixture of ozone and chlorine. As the most reactive of all the...
2-(Trifluoromethyl)imidazole undergoes facile alkaline hydrolysis to imidazole-2-carboxylic acid (in 0.1 N KOH at 30掳C, t1/2 = 5.8 h), the 4-methyl derivative being 12-fold as reactive as the parent compound. The rate-limiting step is t... H Kimoto,LA Cohen - 《J.org.chem》 被引...
ChemInform Abstract: Cation‐Stabilizing Auxiliaries in Polyene Cyclizations. Part 7. The Fluorine Atom as a Cation‐Stabilizing Auxiliary in Biomimetic Polyene Cyclizations. Part 4. Total Synthesis of dl‐β‐Amyrin.doi:10.1002/chin.199322111
A fluorine-containing novolac resin represented by the following formula, as well as a fluorine based surfactant and a fluorine based surfactant composition, which include the fluorine-containing novolac resin. In the formula, R represents a fluorinated alkyl-containing substituent, R′ represents a hy...