Reactive Intermediates
In chemistry, reactive intermediates are termed as short-lived, highly reactive atoms with high energy. They rapidly transform into stable particles during a chemical reaction. In specific cases, by means of matrix isolation and at low-temperature reactive intermediates can be isolated.
Hydride Shift
A hydride shift is a rearrangement of a hydrogen atom in a carbocation that occurs to make the molecule more stable. In organic chemistry, rearrangement of the carbocation is very easily seen. This rearrangement can be because of the movement of a carbocation to attain stability in the compound. Such structural reorganization movement is called a shift within molecules. After the shifting of carbocation over the different carbon then they form structural isomers of the previous existing molecule.
Vinylic Carbocation
A carbocation where the positive charge is on the alkene carbon is known as the vinyl carbocation or vinyl cation. The empirical formula for vinyl cation is C2H3+. In the vinyl carbocation, the positive charge is on the carbon atom with the double bond therefore it is sp hybridized. It is known to be a part of various reactions, for example, electrophilic addition of alkynes and solvolysis as well. It plays the role of a reactive intermediate in these reactions.
Cycloheptatrienyl Cation
It is an aromatic carbocation having a general formula, [C7 H7]+. It is also known as the aromatic tropylium ion. Its name is derived from the molecule tropine, which is a seven membered carbon atom ring. Cycloheptatriene or tropylidene was first synthesized from tropine.
Stability of Vinyl Carbocation
Carbocations are positively charged carbon atoms. It is also known as a carbonium ion.
![Alkyl Halides (X = CI, Br or I): Assume AICI, is present if needed
CHX
A
B
D
Alcohols
CHOH
AA
BB
DD
EE
FF
G
Ketones, Aldehydes and Epoxides: Assume "then H,O" is included if a protonation step is needed
A A
J
K
L
M
N
P
R
Acid Chlorides: Assume AICI, is present if needed
Grignard and Wittig Reagents: Assume "then H,0" is included if a protonation step is needed
MeMgBr EIMgBr PhMgBr PHCH,MgBr PhyP=CH, PhyP=CHCH, PhyP=CHCO,E Ph,PCH,Ph
G1
G2
G3
G4
W1
w2
W3
W4
Other Reagents:
1H,O' (dilute H,sO)
11 PCC in CH,C
12 Na,CryOr, H,SO, H0
13 BH, THF or 9-BBN, then HO. NaOH
21 Brz. FeBr,
22 Mg. Et,0
23 Cl,. AICI,
24 SOCI, pyridine
25 HNO,, HSO.
26 fuming H,SO,
27 Fe, HCI; then NaOH
2 conc. H,SO., heat
3 NaOEt
4 -BUOK
14 Hg(OAc). H0, then NaBH,
15 O, then Zn, HCI or DMS
16 МСРВА or CH,со,н
17 Brz. light or NBS, heat
5 H. Pt
6 H. Lindlar's catalyst
7 Na, NH,
8 LAH or xs LAH, then H0
9 NaBH, CH,он
10 NaBH,CN, pH 5
18 HBr
28 Zn(Hg), HCI
29 KCN, or KCN + HCN
19 HBr, ROOR
20 PBr,
30 Co, then HO
31 (H*), Ho OH (H,0)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9eb30bbe-7a1d-412e-b9ff-795e0bb08fb1%2Fd3cdcf70-b3eb-4218-a303-bb933eef564c%2Fx2gknp_processed.jpeg&w=3840&q=75)
![Using the reagent list, determine the sequence of reagents needed to complete the synthesis below.
Step 1
Step 2
Step 3
A Moving to another question will save this response.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9eb30bbe-7a1d-412e-b9ff-795e0bb08fb1%2Fd3cdcf70-b3eb-4218-a303-bb933eef564c%2Fkiu8b4_processed.jpeg&w=3840&q=75)
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