5) Additions et soustractions de radicaux Règle
5) Additions et soustractions de radicaux Règle : La somme de deux radicaux semblables (de même radicand) est un radical semblable dont le coefficient est la somme des coefficients Exemples : 5 2 +3 2 = (5+3) 2 =8 2 2 18 −3 50 = 6 2 −15 2 = (6−15) 2 = −9 2 Réduis les sommes suivantes : 33+53= 12+53=7 5 −3 5 −6 5 =
Adding and Subtracting Radical Expressions Date Period
©R t20 1P2K qKlu atea t 2S 0o mf6t1wva6r DeT IL KL5CJ T W oAQlNl 8 2rLi4g7h QtmsW Wrweis geur qve3dW b d XMIa TdFe c rwui AtPh Y 0I ynIf Di1n BibtJec BA Il lg oe6bSr7a r j1 g W Worksheet by Kuta Software LLC
Organic Mechanisms: Radicals Chapter 2
E) Addition followed by Fragmentation The (normal) radical addition of Carbon tetrachloride with aliphatic double bonds involves the addition of the CCl 3 radical to the double bond, followed by chlorine atom abstraction from another CCl 4 to give the product In suitable (special) cases, the intermediate carbon radical can fragment before chlorine
FREE-RADICAL ADDITION OF HYDROGEN BROMIDE TO ALKENES
addition has the “normal” regioselectivity shown in Eq 5 41 The peroxide effect is observed with all alkenes in which alkyl substitution at the two car-bons of the double bond is different In other words, in the presence of peroxides, the addition of HBr to alkenes occurs such that the hydrogen is bound to the carbon of the double bond
from Organic Chemistry - Department of Chemistry College of
H-Br Addition Regiochemistry (11 6C) 11-29 Radical versus Electrophilic Addition Radical Stability Steric Effects H-Br Addition Stereochemistry (11 6D) 11-32 H-I, H-Cl, and H-F Additions are Electrophilic (11 6E) 11-33 Radical Addition of Br2 or Cl2 (11 6F) 11-34 Mechanism Competitive Substitution F2 and I2
III- RACTIONS RADICALAIRES
STABILITÉ RELATIVE DES RADICAUX ALKYLES Les valeurs des DH0 nous permettent aussi d'estimer la stabilité relative des radicaux Par exemple, les valeurs de DH0 ne sont pas les mêmes selon que l'on brise un lien C-H primaire ou secondaire du n-propane CH3-CH2-CH 2H CH3-CH-CH3 H
Lec 16 - Oxidative Addition
• Upon addition of O 2, Ir(I) reduces the O 2 to O 2 2−, the peroxide ion, which coordinates to the Ir(III) •Why not envisage the reaction as a ligand addition by regggarding O 2 as a 2e donor such as ethylene? • This is a result of the different formal oxidation states assigned to the L and X 2 extreme pictures ofbinding
Lewis Structure Representation of Free Radicals Similar to ClO
tem In addition to the pedagogical value of the clarification of Lewis structures, halogen oxide molecules are of interest since they promote stratospheric ozone depletion and tropo-spheric ozone production (7–10) A simple Lewis structure interpretation of these species may therefore be of interest to students of atmospheric chemistry
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