The tertiary amine-catalyzed C-C bond-forming reaction of aldehydes with αβ- unsaturated compounds like acrylates or vinyl ketones is known as the Baylis-Hillman reaction (Scheme 32.1). The process occurs in the presence of catalytic amounts of base, generally DABCO (1,4-diazabicyclo[2.2.2...
mirrorobject/mirrorimagepaircorrectlydrawnin3D(1)[3] [Total:11] 4.(22) (a)Completethefollowingreactionschemewhichstartswithpropanone. Ineachemptybox,writethestructuralformulaoftheorganiccompoundthatwould beformed. (b)OneofthecompoundsV,W,X,YorZischiral. ...
A-level生物的markscheme也比较具有迷惑性,就算你理解具体的概念有时候也很难得分,因为可能要求用特定的术语以特定的方式来展示这个概念或知识。 总结一下,一开始学习A-level生物有一定难度,但是在现有知识基础上、巩固好新概念、及时获得相关资料,那A-level生物就会...
Organic chemistry就要稍微复杂一些了，因为含碳链的可变性太多了，但是好在A-level是考虑到为几乎没有基...
The level scheme of 91 Nb has been investigated with the reaction 90 Zr( p , γ) 91 Nb. Proton energies between 3.0 and 7.2 MeV were used. The γ spectra were taken with Ge(Li) detectors. Primary γ transitions to 36 excited states of 91 Nb up to 3.8 MeV excitation energy and ...
3 Chemical bonding 4 States of matter 5 Chemical energetics 6 Electrochemistry 7 Equilibria 8 Reaction kinetics Inorganic chemistry 9 The Periodic Table: chemical periodicity 10 Group 2 11 Group 17 12 An introduction to the chemistry of transition elements 13 Nitrogen and sulfur Organic chemistry and...
The level scheme of 91 Nb has been investigated with the reaction 90 Zr( p , γ) 91 Nb. Proton energies between 3.0 and 7.2 MeV were used. The γ spectra were taken with Ge(Li) detectors. Primary γ transitions to 36 excited states of 91 Nb up to 3.8 MeV excitation energy and many...
PMT Cambridge International AS A Level * 2 4 CHEMISTRY 9701/22 6 0 Paper 2 AS Level Structured Questions May/June 2020 0 0 1 hour 15 minutes 0 7 3 You must answer on the question paper. 4 * You will need: Data booklet INSTRUCTIONS ● Answer all questions. ● Use a black or dark...
Physical chemistry 1 Atoms, molecules and stoichiometry 2 Atomic structure 3 Chemical bonding 4 States of matter 5 Chemical energetics 6 Electrochemistry 7 Equilibria 8 Reaction kinetics Inorganic chemistry 9 The Periodic Table: chemical periodicity ...
CHEMISTRY Paper1(MultipleChoice) Page1MarkSchemeSyllabusPaper CHEMISTRY–JUNE200497011 QuestionQuestion Key NumberNumber 1C21B 2B22D 3C23D 4B24B 5C25A 6C26D 7D27C 8B28D 9B29A 10D30D 11D31A 12C32D 13B33C 14A34D 15A35B 16A36C 17D37A ...