CAS: 2426-02-0; 4,5,6,7-Tetrahydro-2-Benzofuran-1,3-Dione

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📜Cis-1,2,3,6-Tetrahydrophthalic Anhydride置于phosphorus Pentoxide体系中,化学反应生成3,4,5,6-四氢苯酐
参考文献:150 K时3,4,5,6-四氢邻苯二甲酸酐的晶体结构
标题:150 K时3,4,5,6-四氢邻苯二甲酸酐的晶体结构
摘要:测定3,4,5,6-四氢邻苯二甲酸酐(= 4,5,6,7-四氢异苯并呋喃-1,3-二酮;1; C 8 H 8 O 3)的晶体结构,并通过分析150 K的三维x射线衍射数据.该双环化合物在空间群pbca中结晶,具有两个不依赖于对称性的分子i和ii每个不对称单位.两个分子中的环己烯环均采用半椅构象.晶体相中六元环的构象描述与分子轨道计算得出的构象数据一致.结构分析表明部分氢化的六元环有相当大的畸变.呋喃环在分子i中变平,在分子ii中略微偏离平面度.对于co⋅⋅⋅co发现的短分子间距离可解释为偶极-偶极类型的非键相互作用的证据.较长的o⋅⋅⋅h距离表明c(sp 3)-H⋅⋅⋅o相互作用弱.
Doi:10.1002/hlca.200490140

专利信息

专利号:US-2010055750-A1
优先权日:2008-09-03
标 题:Polyester synthesis
发明人：WOSNICK JORDAN H
权利人:XEROX CORP
摘要:The present disclosure provides for enzymatic polymerization to produce polyester resins suitable for use in manufacturing toners. In embodiments, crystalline copolymers, which are polyesters, may be synthesized from lactones, cyclic anhydrides, cyclic carbonates, and combinations thereof. These crystalline copolymers, in turn, may be utilized in the synthesis of toner particles.

专利号:US-7378262-B2
优先权日:2001-12-03
标题:Reversibly modified thermostable enzymes for DNA synthesis and amplification in vitro
发明人：SOBEK HARALD; GREIF MICHAEL
权利人:ROCHE MOLECULAR SYSTEMS INC
摘要:The invention relates to a composition comprising a first modified thermostable enzyme exhibiting 3′exonuclease activity but essentially no DNA polymerase activity and a second modified thermostable enzyme exhibiting DNA polymerase activity, whereas the fidelity of an amplification process is enhanced by the use of the composition in an amplification process in comparison to the use of the single second enzyme in an amplification process and, whereas said first and said second modified thermostable enzyme is reversibly modified by an inhibiting agent which results in essentially complete inactivation of enzyme activity, wherein incubation of said first and said second modified thermostable enzyme in an aqueous buffer at alkaline pH at a temperature less than 25° C. for 20 minutes results in no significant increase in the activity of said first and said second modified thermostable enzyme, wherein incubation at a temperature greater than 50° C. in an aqueous buffer at alkaline pH results in at least tow-fold increase in enzyme activity in less than 20 minutes which allow formation of primer extension products.

专利号:US-4801408-A
优先权日:1983-05-16
标题:2-substituted phenyl-4,5,6,7-tetrahydro-2H-isoindole-1,3-diones, and their production and use
发明人：NAGANO EIKI; YOSHIDA RYO; MATSUMOTO HIROSHI; HASHIMOTO SHUNICHI; KAMOSHITA KATSUZO
权利人:SUMITOMO CHEMICAL CO
摘要:3-Amino-4-fluoro-6-halophenylthioacetic acids of the formula: ##STR1## and 5-substituted acetanilides of the formula: ##STR2## which are intermediary compounds for the synthesis of herbicidally effective 2-substituted phenyl-4,5,6,7-tetrahydro-2H-isoindole-1,3-diones of the formula: ##STR3## through the corresponding acid of the formula: ##STR4## (wherein X is a chlorine atom or a bromine atom, R is a C 1 -C 6 alkyl group, a C 3 -C 7 cycloalkyl group, a C 3 -C 6 alkenyl group, a C 3 -C 6 alkynyl group, a C 2 -C 6 haloalkyl group, a C 1 -C 4 alkoxy(C 1 -C 4 )alkyl group, a C 1 -C 6 alkoxycarbonyl(C 1 -C 3 )alkyl group or a phenyl group and Z is --NO 2 , --NH 2 , --SCH 2 COOH, --SO 2 Cl, --SO 3 H or --SH).

专利号:US-2017044506-A1
优先权日:2009-10-09
标题 :cDNA SYNTHESIS USING A REVERSIBLY INACTIVATED REVERSE TRANSCRIPTASE
发明人：XI LEI (LARRY); NAGEL ROLAND; HENDRICKS STEPHEN; BERKMAN JENNIFER; PERIS MARIAN; WANG YULEI
权利人:LIFE TECHNOLOGIES CORP
摘要:The present invention provides compositions and methods for a reverse transcription reaction using a reversibly inactivated reverse transcriptase enzyme. The reversibly inactivated reverse transcriptase enzyme results from a chemical modification which inactivates the reverse transcriptase enzyme. The activity of the reverse transcriptase enzyme is recovered by an incubation of the reaction mixture at elevated temperature prior to, or as part of the reverse transcription reaction. The reverse transcriptase enzyme of the present invention provides for a significant reduction in non-specific reverse transcription from template nucleic acid molecules because the formulation of the reaction mixture does not support the formation of reverse transcription products prior to activation of the reverse transcriptase.

专利号:US-6809202-B2
优先权日:1996-11-07
标 题 :Diketodiazacyclic compounds, diazacyclic compounds and combinatorial libraries thereof
发明人：NEFZI ADEL; OSTRESH JOHN M; HOUGHTEN RICHARD A
权利人:TORREY PINES INST
摘要:The synthesis of individual di- and tri-substituted-1,4-diazacyclic compounds having 6- to 8-atoms in the cyclic ring, their corresponding 1,6-diketo-2,5-diazacyclic compounds and similar 1,4-diazacyclic ring compounds having one ring carbonyl gorup and 6-8 atoms in the ring is disclosed, as are libraries of such compounds. Methods of preparing and using the libraries of compounds as well as individual compounds of the libraries are also disclosed.

专利号:CA-2704377-C
优先权日:2009-05-26
标 题 :Processes for the synthesis of polyester resins