Whatis Rs and Ez configuration
Answers
Answer:
E-Z notation
The R-/S- notation is valid only for the absolute configuration of a center having single bonds only. In the case of a double bond, the traditional cis/trans nomenclature system is not sufficiently accurate and the E-/Z- is currently preferred. The basis is again the CIP priority rules.
R- and S-notation use the CIP priority rules for the assignment of the absolute configuration around a stereocenter.
First, assign priorities as described above to each bonded group surrounding the stereocenter (1, highest to 4, lowest).
Second, point the lowest priority (4) atom away from you. Follow the direction of the remaining 3 priorities from highest to lowest priority (lowest to highest number, 1<2<3).
A counterclockwise direction is an S (sinister, Latin for left) configuration. A clockwise direction is an R (rectus, Latin for right) configuration.
Direction of the travel 1-2-3 dictates configuration
R-S system RULES OF PRIORITY ORDER:-
(1)According to the atomic number when only atom is present and in a group the direct attached atom is considered with atomic number.
(2)When two or more groups have similar first atom, the priority is determined by considering the atomic number of second atom.
(3)If the first atom of two same groups have same substitutes of higher no will get more priority.
(4)More atomic number containing atom and how many atoms are present of the higher atomic number containing elements.
The R-/S- notation is valid only for the absolute configuration of a center having single bonds only. In the case of a double bond, the traditional cis/trans nomenclature system is not sufficiently accurate and the E-/Z- is currently preferred.
The basis is again the CIP priority rules.