2-Penem-3-carboxylic acid compounds of the formula ##STR1## in which R.sub.1 represents hydrogen, an organic radical bonded by a carbon atom to the ring carbon atom or an etherified mercapto group and R.sub.2 represents hydroxy or a radical R.sub.2.sup.A forming together with the carbonyl grouping --C(.dbd.O)-- a protected carboxyl group, 1-oxides thereof, as well as salts of such compounds having salt-forming groups, in racemic and optically active form, processes for their preparation, pharmaceutical compositions containing such compounds, and their use as antibiotics, and intermediates and their processes which are useful in the production of the compounds of the formula I.
An antifouling coating composition having an excellent coating film strength and also has markedly superior antifouling properties, and a novel resin which is useful as a matrix resin for the composition are provided. The antifouling coating composition comprises a vinyl polymer (A) having, as a repeating unit, a structural unit (a) represented by the following formula (1):
1
(in the formula (1), X
1
and X
2
each independently represents an ester bond or a carbonyl group; R
1
represents an ethylene structure which forms a covalent bond with the carbonyl carbon atom and X
1
in the formula (1) at the same or adjacent carbon atom; R
2
represents a gem-alkylene group, a vic-alkylene group, an arylmethylidene group or an arylethylene group; and R
3
and R
4
represent an alkyl group or an aryl group, or a hydrocarbon group having a carbonyl group, an ether bond or an ester bond) and an antifouling agent (B).
本发明提供了一种涂膜强度极佳且防污性能明显优越的防污涂料组合物,以及一种可用作该组合物基体树脂的新型树脂。这种防污涂料组合物包括乙烯基聚合物(A),其重复单元是由下式(1)表示的结构单元(a):
1
式(1)中,X
1
和 X
2
各自独立地代表酯键或羰基;R
1
代表与羰基碳原子形成共价键的乙烯结构,X
1
在相同或相邻碳原子上形成共价键的乙烯结构;R
2
代表环亚甲基基团、沧亚甲基基团、芳基亚甲基基团或芳基亚乙基基团;以及 R
3
和 R
4
代表烷基或芳基,或具有羰基、醚键或酯键的烃基)和防污剂 (B)。
Synthesis of .beta.-oxopropyl esters by catalytic addition of carboxylic acids and N-protected amino acids to propargyl alcohol
作者:Dominique Devanne、Christophe Ruppin、Pierre H. Dixneuf
DOI:10.1021/jo00239a059
日期:1988.2
DEVANNE, D.;RUPPIN, N CH.;DIXNEUF, P. H., J. ORG. CHEM., 53,(1988) N 4, 925-926
作者:DEVANNE, D.、RUPPIN, N CH.、DIXNEUF, P. H.
DOI:——
日期:——
SALTS OF (S)-(5-CYCLOBUTOXY-2-METHYL-6-(1-(PIPERIDIN-4-YL)-1H-PYRAZOL-4-YL)-3,4-DIHYDROQUINOLIN-1(2H)-YL)(CYCLOPROPYL)METHANONE AND SOLID FORMS THEREOF