摘要:
A process for producing a dialkyl carbonate which comprises reacting at least one member selected from the group consisting of urea and alkyl carbamate with alcohol in the presence of both a catalyst and a high boiling point organic compound having a boiling point of 180.degree. C. or above.
摘要:
A process for producing diaryl carbonate which comprises (A) a step for producing dialkyl carbonate represented by the general formula RO--CO--OR by reacting urea with alkyl alcohol represented by the general formula ROH, (B) a step for producing both alkyl aryl carbonate represented by the general formula RO--CO--OAr and diaryl carbonate represented by the general formula ArO--CO--OAr by reacting dialkyl carbonate produced in the above step (A) with an aromatic hydroxy compound represented by the general formula ArOH, and (C) a step for producing diaryl carbonate represented by the general formula ArO--CO--OAr by allowing to conduct disproportionation reaction of unreacted alkyl aryl carbonate produced in the above step (B), wherein R shows an alkyl group and Ar shows a non-substituted phenyl group or a phenyl group substituted by alkyl group, alkoxy group, aryl group, aryloxy group or halogen.
摘要:
A process for separation between dialkyl carbonate and alkyl carbamate which comprises adding an aromatic hydroxy compound to a liquid comprising alkyl carbamate having an alkyl group having 3 to 6 carbon atoms and dialkyl carbonate having alkyl group having 3 to 6 carbon atoms to obtain a mixed liquid, and distilling the mixed liquid thus obtained in a distillation column to obtain a mixture comprising the dialkyl carbonate and the aromatic hydroxy compound from a top section of the distillation column and a liquid comprising the alkyl carbamate from a bottom section of the distillation column.
摘要:
A process for producing a dialkyl carbonate which comprises performing reaction of allophanate represented by the following general formula (1) and an alkyl alcohol represented by the following general formula (2) as raw materials, thereby producing a dialkyl carbonate represented by the following general formula (3). RO—CO—NH—CO—NH2 (1) ROH (2) RO—CO—OR (3) wherein R is an alkyl group.
摘要:
Anti-ferroelectric liquid crystal substances which are represented by the formula (1): ##STR1## wherein R is a straight chain alkyl group having 6 to 10 carbon atoms,X is hydrogen or fluorine atom,Z is --CH.sub.3, --CF.sub.3 or --C.sub.2 H.sub.5, andC** stands for an asymmetric carbon atom, andl, m, and n are 0 or a certain integer depending on the specific kinds of X and Z,and the use of the substances for liquid crystal display devices.
摘要:
A liquid crystal compound represented by formula (I), ##STR1## wherein A represents --C.sub.3 H.sub.7, --C.sub.4 H.sub.9 or --C.sub.8 H.sub.17 ; when A is --C.sub.3 H.sub.7, m is an integer of 8, 10, 12 or 14; and when A is --C.sub.4 H.sub.9 or --C.sub.8 H.sub.17, m is an integer of 7 to 14,said compound having an antiferroelectric phase.
摘要翻译:由式(I)表示的液晶化合物,其中A表示-C 3 H 7,-C 4 H 9或-C 8 H 17; 当A为-C 3 H 7时,m为8,10,12或14的整数; 当A为-C4H9或-C8H17时,m为7-14的整数,所述化合物具有反铁电相。
摘要:
An antiferroelectric liquid crystal compound which is a compound represented by ##STR1## wherein R denotes a linear aliphatic alkyl group having 6 to 14 carbon atoms; A denotes a single bond or an oxygen atom; X and Y independently denote a hydrogen atom or a fluorine atom but they are not hydrogen atoms at the same time; h and i are independently 1 or 2; m is an integer of 3 to 10; Z denotes CH.sub.3, C.sub.2 H.sub.5 or CF.sub.3 ; k is 0 or an integer of 5 to 8; l is 0 or 1; n is an integer of 1 to 6; W denotes CH.sub.3 or CF.sub.3 ; when W is CH.sub.3, p and q are both 0 and r is 8; when W is CF.sub.3, p is 5 to 8, q is 1 and r is 1 to 4; and C* denotes an asymmetric carbon atom,and a liquid crystal display device using same.
摘要:
Antiferroelectric liquid crystal composition comprising at least one of antiferroelectric liquid crystal substances, and at least one of optically active substances.
摘要:
Novel organic platinum complex of the formula: ##STR1## wherein R.sup.1 is hydrogen atom or a lower alkyl group, R.sup.2 is a substituted or unsubstituted lower alkyl group, a lower alkenyl group, a lower alkanoyl group, a mono- or di-lower alkylamino group, a substituted or unsubstituted nitrogen-containing hetero-monocyclic group, an oxygen-containing hetero-monocyclic group, or a group of the formula:--CH.sub.2 O(CH.sub.2 CH.sub.2 O).sub.m CH.sub.3, X is carbonyl group or sulfonyl group, m is an integer of 1 or 2,which has excellent anti-tumor activity against various tumors and is useful as an anti-tumor agent, and a process for the preparation thereof, and a pharmaceutical composition containing said compound.
摘要:
Provided are an adamantane derivative represented by the following formula (1), a method for producing the same, a polymer containing an acrylate compound having the adamantane structure represented by formula (1) in a repeat unit, and a functional resin composition which contains the polymer, has excellent alkali developability and substrate adhesiveness, and can improve the resolution and the line edge roughness as a chemically amplified resist sensitive to far-ultraviolet rays represented by KrF excimer laser light, ArF excimer laser light, F2 excimer laser light or EUV without spoiling fundamental properties thereof as a resist such as pattern forming properties, dry etching resistance, heat resistance and the like. In the formula, R1 through R3, which may be the same or different, each represent a hydrogen atom, an alkyl group having a carbon number of 1 to 3, or a halogen-containing alkyl group; R4 through R8, which may be the same or different, each represent an alkyl group having a carbon number of 1 to 3 or a halogen-containing alkyl group; X, which may be the same or different, represents a hydrogen atom, an alkyl group having a carbon number of 1 to 3, or a alkoxy group having a carbon number of 1 to 3; and n represents 14.