Organocatalysis Episode 1 doc

... Leipzig 21/ 318 0/YL – 543 210 Printedonacid-free paper New Concepts for Organocatalysis 11 Scheme 7. Enamine catalysis of nucleophilic substitution reactions New Concepts for Organocatalysis 15 Scheme 11 . ... addition reactions to aldimines (Scheme 11 ). 3 .1 Catalytic Asymmetric Pictet–Spengler Reaction The Pictet–Spengler reaction (Pictet and Spengler 19 11; Tatsui 19 28) is...

Ngày tải lên: 12/08/2014, 16:21

... kN·m B 4 17 .8 ∆ h = 25q 2 = 25q 1 7.6q 1 100q 1 135.6q 1 C 34 15 1.2 ∆ v = 10 q 2 = 10 q 1 3.0q 1 340q 1 4 61. 0q 1 D 25 11 1.2 ∆ v = 20q 1 6.1q 1 500q 1 678.0q 1 E 22 97.9 ∆ v = 10 q 1 3.0q 1 220q 1 298.3q 1 Total ... (cm 2 ) 1 / 2 (12 .7) 8.59 ( 218 .18 6) 9.09 (230.886) 6 × 3 1 / 2 × 1 / 2 (15 2.4 × 88.9 × 12 .7) 4.50 (29.034) 7 / 16 (11...

Ngày tải lên: 12/08/2014, 07:22

... truncated potential: S(E) = (c N 1 −is N 1 ) + g N 1, N 1 (E)J N 1, N (E)(c N − is N ) (c N 1 +is N 1 ) + g N 1, N 1 (E)J N 1, N (E)(c N + is N ) Here g N 1, N 1 (E)isthe(N 1, N 1) element of the inverse ... V N N 1, n  a n +  J N 1, N c N N + 1  t =−J N 1, N s N N + 1 . (20b) In case three, V N is no longer operative. We consequently get J N,N 1 a N 1 +  J N,N c N N + 1 +...

Ngày tải lên: 12/08/2014, 08:21

... number of filler metal feeding systems available to accomplish the task automatically. Figure 1. 1 shows the essentials of the manual GTAW process. Advantages of the GTAW Process The greatest ... System Power Cord Torc h Gas In Gas Out Adapter Block Gas Valve Work Work Clamp Work Cable Figure 1. 1 Essentials of the GTAW process (water cooled). ... be added to enhance travel speeds. The GTA...

Ngày tải lên: 12/08/2014, 08:21

... Paris, France in 19 76. Since then, the symposium has been held in Lausanne, Switzerland (19 80), Cambridge, England (19 84), Aachen, Germany (19 87), Beijing, China (19 89), Notre Dame, Indiana (19 91) , Fukuoka, ... and Verdon, 19 91] , in particular STCF4 (see figures 1a, 1b). Figure 1a. 4 th standard configuration, case 3. Comparison of computed and experimental pressure perturbation coef...

Ngày tải lên: 12/08/2014, 08:22

... Synlett 2004: 211 1– 211 4 Enders D, Niemeier O, Balensiefer T (2006) Asymmetric intramolecular crossed-benzoin reactions by N-heterocyclic carbene catalysis. Angew Chem Int Ed 45 :14 63 14 67 Fischer ... 53% in both cases (Scheme 14 ). Using IMes as the catalyst in THF at 60 °C resulted in the cyclization of 14 and 16 to the bi- and tricyclic γ- butyrolactones 15 and 17 (Scheme 14 ). B...

Ngày tải lên: 12/08/2014, 16:21

... Chemistry 48 R. Greenwood, G. Mills and B. Vrana (Editors) Volume 48 ISSN: 016 6-526X DOI: 10 .10 16/S 016 6-526X(06)480 01- 6 r 2007 Elsevier B.V. All rights reserved. 3 Contents Contributors to Volume ... microextraction. 6 1. 2 .1 Equilibrium extraction . . 7 1. 2.2 Exhaustive extraction. . . 8 1. 2.3 Pre-equilibrium extraction . . . 9 1. 2.4 Calibration based on first-order reaction...

Ngày tải lên: 12/08/2014, 16:21

... published in 19 84 ISBN 978-3-540-77506-5 DOI 10 .10 07/978-3-540-778 01- 1 e-ISBN 978-3-540-778 01- 1 Scientific Computation ISSN 14 34-8322 Library of Congress Control Number: 2007942575 © 2008, 19 84 Springer-Verlag ... y0 w1 h1" alt="" Contents Some Preliminary Comments xiv CHAPTER I Generalities on Elliptic Variational Inequalities and on Their Approximation 1 1. Introduction 1...

Ngày tải lên: 12/08/2014, 16:21

... f 0  1 4f 0 − 1 4f 0 cos(2πf 0 (1 − n)t)dt = 1 2π (1 + n) sin(2πf 0 (1 + n)t)| 1 4f 0 1 4f 0 + 1 2π (1 − n) sin(2πf 0 (1 − n)t)| 1 4f 0 1 4f 0 = 1 π (1 + n) sin( π 2 (1 + n)) + 1 π (1 − n) sin( π 2 (1 − n)) Thus ... obtain n  i =1 α i β i AB ≤ 1 2 n  i =1 α 2 i A 2 + 1 2 n  i =1 β 2 i B 2 = 1 2A 2 n  i =1 α 2 i + 1 2B 2 n  i =1 β 2 i = 1...

Ngày tải lên: 12/08/2014, 16:21