Polyvinyl alcohol appears as odorless white to cream-colored granules or powder. Pure aqueous solutions are neutral or faintly acid and subject to mold growth. pH (4% aqueous solution): 5-8. Strongly hydrophilic. (NTP, 1992)
颜色/状态:
Dry, unplasticized powders are white or cream colored
气味:
Odorless
味道:
Tasteless
闪点:
79 °C o.c.
溶解度:
Soluble (NTP, 1992)
蒸汽压力:
Negligible (NTP, 1992)
稳定性/保质期:
Stable under recommended storage conditions.
分解:
>200 °C
粘度:
/p>4,8 to 5,8 mPa.s (4 % solution at 20 °C) corresponding to an average molecular weight of 26 000-30 000 Da
Vinyl alcohol. Generation and decay kinetics in aqueous solution and determination of the tautomerization equilibrium constant and acid dissociation constants of the aldehyde and enol forms
Phosphorus and nitrogen-doped palladium nanomaterials support on coral-like carbon materials as the catalyst for semi-hydrogenation of phenylacetylene and mechanism study
Efficient Room‐Temperature
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Silylation of Alcohols Using a SBA‐15‐Supported Cobalt(II) Nanocatalyst
作者:Fatemeh Rajabi、Rafael Luque、Juan Carlos Serrano‐Ruiz
DOI:10.1002/cbdv.201200071
日期:2012.9
O-silylation of OH groups of alcohols and phenols with hexamethyldisilazane (HMDS) was achieved in high-to-excellent yields using catalytic quantities of a SBA-15-supported cobalt(II) nanocatalyst (typically 0.5 mol-%) at room temperature and under solvent-free conditions. Furthermore, the heterogeneous catalyst showed an excellent durability and can be convenientlyreused by filtration for at least
The present invention provides compounds, compositions thereof, and methods of using the same for the inhibition of TYK2, and the treatment of TYK2-mediated disorders.
本发明提供了化合物、其组合物以及使用它们来抑制TYK2并治疗TYK2介导的疾病的方法。
Enolization of Aldehydes and Ketones: Structural Effects on Concerted Acid−Base Catalysis
作者:Anthony F. Hegarty、Joseph P. Dowling、Stephen J. Eustace、Michelle McGarraghy
DOI:10.1021/ja9729544
日期:1998.3.1
the product of the consecutive rate constants (kA·kB) and the concerted (third order) rate constants (kAB). This implies that the concerted pathway is important only when both the generalacid and the generalbase terms are significant; this will be useful in designing other systems which might show such concertedcatalysis. In the case of aldehydes, a slope of 0.97 was found for this plot, which compares
Construction of Cd(II) compounds with a chelating ligand 2,2′-dipyridiylamine (Hdpa): Anion effect, catalytic activities and luminescence
作者:Byeong Kwon Park、Geun Hee Eom、Soo Hyun Kim、Han Kwak、Seung Man Yoo、Yu Jin Lee、Cheal Kim、Sung-Jin Kim、Youngmee Kim
DOI:10.1016/j.poly.2009.10.024
日期:2010.2
Six new structures of Cd(II) complexes containing Hdpaligands have been determined. With chloride and bromide, Cd(II) ions produce halide-bridged dinuclear units 1 and 2 while CdI2 produces mononuclear unit 3 without halide-bridging. Cd(II) ions produce mono-Hdpa complex 4 with chelating benzoate, di-Hdpa complex 5 with coordinating NO3- anion, and tri-Hdpa complexes 6 and 7 with non-coordinating