Hammond's postulate (or alternatively the Hammond–Leffler postulate), is a hypothesis in physical organic chemistry which describes the geometric structure...
20 KB (2,565 words) - 03:51, 9 July 2024
George Simms Hammond (May 22, 1921 – October 5, 2005) was an American scientist and theoretical chemist who developed "Hammond's postulate", and fathered...
31 KB (3,788 words) - 07:28, 29 May 2024
known as Hammond or Hammond's Landing Upper Hammonds Plains, Nova Scotia Stoke Hammond, a village in north Buckinghamshire, England Hammond, Fresno, California...
2 KB (299 words) - 19:53, 18 October 2022
same for all reactions belonging to a particular reaction family. Hammond's postulate Free-energy relationship Brønsted catalysis equation Catalytic resonance...
3 KB (326 words) - 13:24, 31 July 2024
selectivity in chemical reactions can successfully be explained by Hammond's postulate. When reactivity-selectivity relationships do exist they signify...
4 KB (561 words) - 00:17, 27 June 2024
either directly by calculations on transition states, or based on Hammond's postulate, by modeling the steric and electronic demands of the reactants....
48 KB (4,802 words) - 21:36, 13 August 2023
photographic sensitization compounds George S. Hammond (1921–2005), American chemist, famous for Hammond's postulate Arthur Harden (1865–1940), English biochemist...
61 KB (7,579 words) - 22:40, 15 October 2024
1943 alumnus George Hammond who was later dubbed "the father of the movement". Hammond would go on to invent Hammond's postulate, revolutionizing activation...
123 KB (11,996 words) - 17:20, 29 October 2024
1992, and his Nobel Lecture gives an extensive view of his work. Hammond's postulate Solvated electron Free-energy relationship "Electron Transfer Reactions...
40 KB (5,759 words) - 12:52, 4 October 2024
pedagogical demonstration of the reactivity–selectivity principle and the Hammond postulate. A bromine radical is not very reactive and the transition state for...
8 KB (853 words) - 07:34, 3 May 2024
is further described in the article geometry optimization. The Hammond–Leffler postulate states that the structure of the transition state more closely...
8 KB (986 words) - 14:42, 21 October 2024
developed by Westheimer predicted that symmetrical (thermoneutral, by Hammond's postulate), linear transition states have the largest isotope effects, while...
99 KB (13,885 words) - 23:32, 1 September 2024
from electrophilic attack at the ortho/para or meta positions. The Hammond postulate then dictates that the relative transition state energies will reflect...
27 KB (2,728 words) - 23:10, 24 March 2024
nuclei actually occur through a series of simple chemical reactions. Hammond postulate is another tool which assists in drawing the energy of a transition...
29 KB (3,604 words) - 15:06, 13 February 2024
and the other which is mostly-folded. Phi value analysis assumes Hammond's postulate, which states that energy and chemical structure are correlated....
13 KB (1,688 words) - 03:29, 27 October 2024
ability to correlate these energy differences is justified by the Hammond postulate and the Bell–Evans–Polanyi principle. Also, the starting materials...
22 KB (2,532 words) - 15:42, 14 February 2024
reaction Halohydrin formation reaction Hammick reaction Hammond principle or Hammond postulate Hantzsch pyrrole synthesis Hantzsch dihydropyridine synthesis...
37 KB (3,419 words) - 11:08, 19 October 2024
from the original on September 13, 2016. Retrieved 2016-08-29. "George S. Hammond". web.pdx.edu. Archived from the original on June 25, 2016. Retrieved August...
140 KB (6,321 words) - 00:40, 18 October 2024
accordance with the Hammond postulate, the transition state moves along the diagonal towards the corner that is raised in energy (a Hammond effect) and perpendicular...
8 KB (976 words) - 10:30, 21 April 2020
Prespa Lakes, the "Dassaretis" of later topography, not "Dardania", as Hammond postulated" Vujčić 2021, pp. 501–504. Howe 2017, pp. 99, 108. Woodward 1993,...
36 KB (4,431 words) - 17:46, 28 October 2024
code, Hamming distance, Hamming weight – Richard Hamming Hammond postulate – George Simms Hammond Hanle effect – Wilhelm Hanle Hardy notation, space – Godfrey...
72 KB (6,834 words) - 09:36, 13 October 2024
equilibration.[page needed] Mathematically derived formalisms such as the Hammond Postulate, the Curtin-Hammett principle, and the theory of microscopic reversibility...
50 KB (5,561 words) - 12:59, 11 June 2024
Pre-Columbian or the 3,000 years old as postulated by F.A. Mitchell-Hedges. Additionally, many archaeologists postulate that most, if not all, of the skulls...
21 KB (2,576 words) - 02:31, 30 September 2024
Prespa Lakes, the "Dassaretis" of later topography, not "Dardania", as Hammond postulated" Vujčić 2021, pp. 501–504. Cabanes 2002, p. 56. Cabanes 2002, pp. 50–51...
70 KB (8,919 words) - 22:30, 16 February 2024
corresponds to the structure at the top of the energy barrier. The Hammond–Leffler postulate states that this structure looks most similar to the product or...
57 KB (5,649 words) - 14:21, 9 October 2024
underserved consumers and markets in order to create opportunity for all. Among Hammond's earliest publications that discusses the exclusiveness of capitalism is...
21 KB (2,644 words) - 03:10, 5 October 2024
corresponds to the structure at the top of the energy barrier. The Hammond-Leffler Postulate states that this state looks most similar to the product or starting...
3 KB (420 words) - 07:48, 18 December 2023
metric-skew-tensor-gravity (MSTG), in which a skew symmetric tensor field postulated as part of the gravitational action. A newer version of MSTG, in which...
5 KB (573 words) - 11:21, 25 May 2024
set of conclusions is potentially undone once any of its fundamental postulates is disproved. In this case, the observation of a single black swan would...
22 KB (2,713 words) - 17:08, 9 August 2024
hypothesis postulated that extracellular amyloid beta (Aβ) deposits are the fundamental cause of the disease. Support for this postulate comes from the...
186 KB (19,741 words) - 21:12, 1 November 2024