L-2-Hydroxysuccinamic acid prepared from L-asparagine was dehydrated with aceticanhydride in pyridine, affording the respective ω-cyano acid, which, on catalytic hydrogenation, gave the title compound. Similarly, the amide groups of some other β- and γ-amic acids were dehydrated to give the respective cyano acids in good yields.
Amine compounds as contrast enhancers for black-and-white
申请人:Minnesota Mining and manufacturing Company
公开号:US05545505A1
公开(公告)日:1996-08-13
Hydroxylamine, alkanolamine, and ammonium phthalamate compounds are useful as contrast enhancers when used in combination with (i) hindered phenol developers, and (ii) trityl hydrazide and/or formyl-phenyl hydrazine co-developers, to produce ultra-high contrast black-and-white photothermographic and thermographic elements. The photothermographic and thermographic elements may be used as a photomask in a process where there is a subsequent exposure of an ultraviolet or short wavelength visible radiation-sensitive imageable medium.
Benzimidazole-4-carboxamide compounds (I) which can act as potent inhibitors of the DNA repair enzyme poly(ADP-ribose) polymerase or PARP enzyme (EC 2.4.2.30), and which thereby can provide useful therapeutic compounds for use in conjunction with DNA-damaging cytotoxic drugs or radiotherapy to potentiate the effects of the latter. In formula (I), R and R' may each be selected independently from hydrogen, alkyl, hydroxyalkyl (e.g. CH.sub.2 CH.sub.2 OH), acyl (e.g. acetyl or benzoyl) or an optionally substituted aryl (e.g. phenyl) or aralkyl (e.g. benzyl or carboxybenzyl) group. R is generally a substituted phenyl group in the most preferred compounds. The compounds may also be used in the form of pharmaceutically acceptable salts or pro-drugs. ##STR1##
Aqueous coolant for the running-in period of an engine containing ammonium salts of monophthalimides
申请人:Wenderoth Bernd
公开号:US20050040362A1
公开(公告)日:2005-02-24
The present invention relates to aqueous coolants having vapor-space corrosion inhibiting properties, in particular for the run-in phase of internal combustion engines, after which the coolant is drained (engine run-in fluids), containing at least one ammonium salt of phthalic acid monoamides of the following formula (I),
where R
1
and R
2
may be identical or different and are hydrogen or a linear or branched, cyclic or acyclic C
1
-C
20
-alkyl radical and A
+
is an ammonium cation.
本发明涉及具有蒸汽空间腐蚀抑制特性的水性冷却剂,特别是用于内燃机的磨合阶段,在磨合阶段之后,冷却剂被排出(发动机磨合液),其中含有至少一种下式(I)的邻苯二甲酸单酰胺铵盐、
其中 R
1
和 R
2
可以相同或不同,并且是氢或线性或支链、环状或非环状的 C
1
-C
20
-烷基和 A
+
是铵阳离子。
Laurent, Annales de Chimie (Cachan, France), 1848, vol. <3> 23, p. 117