摘要:
Oxalic acid diarylamides are described as useful monomers and comonomers in the polymerization of polycarbonates. The resin products resist degradation by ultra-violet light radiation. They can also be incorporated as comonomer or monomer in the polyester, polyester, polyether, polyethersulfone resins. They can also be used as UV stabilizers in the aforemetioned systems.
摘要:
Alkyl carbazates of the formula R.sup.1 --O--CO--NH--NH.sub.2 (I) are prepared in an advantageous manner by reacting an alkyl carbazate of the formula R.sup.2 --O--CO--NH--NH.sub.2 (II) with alcohols of the formula R.sup.1 --OH (III) in the presence of a catalyst, where the symbols used in the formulae are as defined in the description.
摘要:
An aqueous two-component polyisocyanate coating composition is based on an essentially isocyanate-free emulsifier that comprises the reaction product of: (i) an isocyanate and (ii) a member selected from the group consisting of: hydroxy functional polyalkyl ethers containing at least five ethylene oxide, alcohols different from said polyalkyl ethers, amine compounds, and combinations thereof. The hydroxy functional polyalkyl ether is provided in a quantity sufficient to react at least one equivalent of isocyanate groups in polyisocyanate (i), and the total amounts of reactants (ii) are sufficient to react all of the isocyanate groups of the polyisocyanate (i).
摘要:
A family of aza-ether based compounds including linear, multi-branched and aza-crown ethers is provided. When added to non-aqueous battery electrolytes, the family of aza-ether based compounds acts as neutral receptors to complex the anion moiety of the electrolyte salt thereby increasing the conductivity and the transference number of Li.sup.+ ion in alkali metal batteries.
摘要:
New arginine derivatives containing an N.sup..alpha. -alkyloxycarbonyl group of formula (I) ##STR1## in which R represents a linear or branched alkyl radical having from 8 to 22 carbon atoms, salts thereof, and mixtures of the derivatives and the salts. A process for the preparation of these derivatives, salts, and mixtures and use of such derivatives, salts, and mixtures, especially in cosmetics. Compositions, especially cosmetic compositions, comprising the derivatives, salts, and mixtures.
摘要:
Novel organic compounds and metal ion-containing amino acid chelates are described which are useful in solid phase synthesis of polypeptides and as magnetic resonance imaging (MRI) enhancing agents. The present invention also relates to a convenient and straightforward method to synthesize a metal-ligating amino acid suitable as MRI enhancing agents or for introducing a strong metal binding site at any chosen position in a peptide. Some compounds are designed to be compatible with N-.alpha.-Fmoc peptide synthesis strategy, and can easily be prepared on large scale. Thus, flexible linkers of different lengths and containing various structures can be placed between the .alpha.-carbon backbone of peptides and metal binding moieties. These peptides will provide a variety of affinity cleaving reagents which can be directed against protein or nucleic acid targets. Therefore, these molecules can serve as an important tool to study protein folding, protein-protein and protein-nucleic acid interactions.
摘要:
The novel compounds of the formula I ##STR1## in which A is a group of the formula IIa or IIb, ##STR2## Y is oxygen, methylene, ethylidene or a >C.dbd.C(CH.sub.3).sub.2 group, Z is nitrogen, ##STR3## R.sub.1 and R.sub.2 are, for example C.sub.1 -C.sub.5 alkyl, R.sub.3 and R.sub.4 are, for example, hydrogen or methyl, and R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.10, R.sub.11, R.sub.12, R.sub.13 and R.sub.14 are, for example, hydrogen, are suitable for stabilizing organic material against oxidative, thermal or light-induced degradation.
摘要:
There is disclosed an ester compound that is resistant to decomposition in blood, but is quickly hydrolyzed in cancer cells, and functions as an anticancer agent. The ester compound has a structure represented by formula (I) or formula (II): ##STR1## wherein R.sub.1 represents a methyl group, a methoxy group, or a trifluoroacetamido group; R.sub.2 represents a phenyl group or a phenylmethyl group; and the absolute configuration of the asymmetric center marked with an asterisk is R.
摘要翻译:公开了一种对血液中的分解有抗性但在癌细胞中迅速水解的酯化合物,作为抗癌剂起作用。 酯化合物具有由式(I)或式(II)表示的结构:其中R 1表示甲基,甲氧基或三氟乙酰胺基;式(I)其中R 1表示甲基, R2表示苯基或苯甲基; 并且标有星号的不对称中心的绝对配置为+ E,uns R + EE。
摘要:
Disclosed as a particular isocyanate prepolymer composition particularly suitable for use in polyurethane compositions having particular applicability for producing microcellular molded polyurethane articles particularly suitable for use as sealing devices. In particular, the isocyanate prepolymer composition is the result of reacting an isocyanate blend (a) having(i) 0 to 10 pbw 2,4'-diphenylmethane diisocyanate;(ii) 30 to 80 pbw 4,4'-diphenylmethane diisocyanate;(iii) 1 to 10 pbw of a mixture of uretoniminewith from 10 to 70 parts by weight of a polyol (b) having a number average molecular weight of between 1000 and 10,000, and a hydroxyl number of between 10 to 75. The resulting isocyanate prepolymer (I) has a free NCO of less than 20 and a viscosity of from 200 to 1000 cPs.
摘要:
Provided is a compound of the formula: ##STR1## This compound is an intermediate to and is used for preparing the arthropodicidal oxidiazine Compound II described in the specification.