The Australian orchid Chiloglottis trapeziformis' very existence hinges upon there being some truth to the old adage that love is blind. Unlike other flowers, which lure pollinators with nectar, C. trapeziformis attracts its pollinator, the thynnine wasp Neozeleboria cryptoides, by producing the same pheromone that the insects use to attract the opposite sex–a practice… Continue reading Chiloglottone –Australian orchid uses a single simple diketone to attract wasps that pollinate it
Month: August 2012
2′-Hydroxychalcone to Flavanone: Asymmetric Catalysis
http://onlinelibrary.wiley.com/doi/10.1002/ejoc.201200838/abstract Asymmetric Ion-Pairing Catalysis of the Reversible Cyclization of 2′-Hydroxychalcone to Flavanone: Asymmetric Catalysis of an Equilibrating Reaction Lukas Hintermann and Claudia Dittmer The cyclization of nonactivated 2′-hydroxychalcones to flavanones has been realized for the first time with asymmetric induction. In spite of the reversibility of the reactions, this ion-pairing catalysis reaches intrinsic enantioselectivities… Continue reading 2′-Hydroxychalcone to Flavanone: Asymmetric Catalysis
COLOURFUL MECHANISMS-ACADEMIC HELP
Epoxidation OZONOLYSIS oxidations DIELS ALDER RXN We noted earlier that addition reactions of alkenes often exhibited STEREOSPEFICITY, in that the reagent elements in some cases added syn and in other cases anti to the the plane of the double bond. Both reactants in the Diels-Alder reaction may demonstrate stereoisomerism, and when they do it is… Continue reading COLOURFUL MECHANISMS-ACADEMIC HELP
Cram’s rule
The Cram’s rule of asymmetric induction developed by Donald J. Cram in 1952, is an early concept relating to the prediction of stereochemistry in certain acyclic systems. In full the rule is: In certain non-catalytic reactions that diastereomer will predominate, which could be formed by the approach of the entering group from the least hindered side… Continue reading Cram’s rule
HOECHST MARION ROUSSEL
I WAS A PART PROCESS DEVELOPMENT LAB , MULUND, MUMBAI, INDIA, HEAD, DR RALPH STAPEL IN CENTRE
CUBANE SYNTHESIS
CubaneCubane (C8H8) is a synthetic hydrocarbon molecule that consists of eight carbon atoms arranged at the corners of a cube, with one hydrogen atom attached to each carbon atom. A solid crystalline substance, cubane is one of the Platonic hydrocarbons. It was first synthesized in 1964 by Philip Eaton, a professor of chemistry at the… Continue reading CUBANE SYNTHESIS