Chapter xiv. The main repertoire of response i and this chapter is characterized by a one-step transition through the loop, with a high degree of regional selectivity and monopolization。
1. Ringing into [characteristics] (1) ringing and plus one step complete, working together。
The occurrence of cycling and reaction is facilitated when there is electron-based and parent-bisolene-sorting on the dioxin。
For example: +o150o c benzene o-o-o-bilene nc+ncncch=ch 2cn(2) circulator is unchanged。
For example: +h 3ch 3cooch 3h 3c h 3cooch 3cooch 3+ ch 3cooch 3h 3cooch 3cooch 3 (3) when there is a replacement base for dioxin and parentobisolene, it is generally produced in the neighbourhood, in the opposite direction and rarely in the intermediate product。
For example, when nch 3ccn h 3c++ch3c 6h 5h 3c 6h 5(4) ring co-dioxin reacts, it is mainly internal products。
For example, +ococh 3coch 3h+ooooo2 and electrocyclic reaction to co-hexachloropentate shut-down generation and its reverse reaction are called electrocyclic reaction。
For example, ch 3h ch 3h (e, z, e), 4-h2h photo-heated to hh 3h tp ch 3ch 3h contortion, 4-dimethylcyclobutylene trans-3, 4-methylcyclobutylene photo-heated to thh 3h h (z, e), 2, 4-h2 (z, z, e), 4, 6-octane photo-heated to th-5 and 6-dimethylcyclodiethylene photo-heat to thch 3h 3hch 3h h ch 3ch 3ch 3ch3 (e, z, e), 4, 6-octyl chloride h ch 3, 6-dimethylcyclodiethylene heat reaction is critical in the response to gh。
Molecular leaps in the light are in a stimulating state。
At this time, the moleculehomo is the lumo at the base state。
The pattern of electro-ring reaction is shown below。
Coincidence of electrons examples of reaction thermal reaction thermal reaction photoreflection 4n rotation allowing rotation 4n + 2 allowing rotation allowing 3 and claison reordering and cope reordering all of them are migratory reactions, which are characterized by six cycling transitions under heating conditions。
Ii. Case 1 and completed the following reactions: (1) ch 3ch 3h ? H ch3ch 3hv ? Hh(3)? H(4)c c h 3ch3h 2hv + oo oo room temperature 150o c? O o?(6) h3c?(7)? O ch2ch3(8) + ch2cooch3coch3coc3? ? ? ? ? ? (3) ch , ch3 ch3 ch3 (2)hv (3)(hv ? (4) hch3ch3ch3h3h3 + hch3h3(ch3 ch3 ch3 ch3 3c3(ch3 ch3 ch3 3) , 3 ch3 ch3 & 3 ch3 & 3 ch3 & 3 ch3 ch3 & 3 ch3 ch3 & 3 ch3 & 3 ch3 ch3 & 3 ch3 & 3 ch3 & 3 ch3 & 3 ch3 & 3 ch3 ch3 & 3 ch3 & 3 ch3 & 3 ch3 ch3 & 3 ch3 & ch3 tbt can only be converted to dewar under photogenic conditions。
(2) ch3ch 3ch 3ch 3h transport h transport 112233455hh321 (3) ch 3ch 3ch3ch 3ch 3ch 3ch 3ch 3cch cyclic c transport 45h 3c21 (4) ch 3h transport 4n system circulatory ch 2 h453 case 3, 4-bromo-2-cyclopentanene reacts with alkaline heating, with two molecules of compounds a and b of c10h 10o in its byproduct, writing out their structural patterns and describing them in a reactive manner。
Answer: brooh-oo+o(a)o(b)+example 4, compound a(c 10h 16o2) obtained products b and c in gaseous thermal cracks。
Among them, the ir of b had strong characterizations at 1725,1665,968cm-1。
1hnmr data for b are 1. 24 (triple peak, 3h), 1. 88 (biple peak, 3h), 4. 13 (quant, 2h), 5. 81
Single-peak (low-resolution non-defunct), 1h
, δ6. 95 (single peak, 1h), write b, c structure and explain the response mechanism。
Answer: ch 3coch 2h 3o+a b cd e abcnmra. 1. 88 double peak 3hb 5. 81 single peak 1hc 6. 95 single peak 1hd 4. 13 four peaks 2h 1. 24 third peak 3h h h ch 3coch 2ch 3=oir 1725 cm - 1 ester thillyl absorbs the external bending of 968 cm - 1 line-c-h as example 5, synthesis by a specified feedstock: (1) synthesis of acrylene and other open-chained compounds of acetamine。
(2) synthesis by benzene, acrylene and other necessary reagents: och(ch 3) 2ch 2ch 2o = hcnh 2h 2nnh 2(2). 1. Enriched h 2so 42. N 2so 3noh-ona = ch 2ah 3ch 3po 4oh(ch3) 2oh 2oh 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h (ch 3) (ch 3) 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 2h 3x h(h) 2 h(h) 3 ch 3 ch 3(h 3) ch 3 ch 3(h 3) ch 3(h) 3h 3(h 3) ch 3(h 3) h3(h 3) h3(h 3) h3(h) 3h3(h 3) h3 h3(h3 h3 h(h 3)(h 3)(h 3) h3(h)(h)(h。
+oooohhh answer: ooooohhh4 indicates the conditions required for the following reaction processes: hh(1) hhhhhhh (2) hhhhhhhhhhh answer: hh(1) hhhhhhhhhhhh (2) hhhhhhhhhhhv spin thv thv thv thv thv, rdd? D hdr answer: rhddr 3211, 3hddr1,36 self-selected raw materials synthesize the following compounds by collating the reaction。
Oo(1)ocho(2) answer: oo(1)ocho(2)+ooo+o7, what will happen with the heating of the following compounds? R(1)(2) answer: what kind of reaction product (i or ii) can be obtained when r(1)(2)r8 and the following reactions are performed in photochemistry? (1) hv or iii(2)hv or iii answer: (1) hv i circulator (2) hv i i i spin 9, and through what process and conditions the following reactions can be obtained。
Oooophphph answer: ooooophphhhphv twirl phphh10, through which the reverse-9,10-dihydrazine is converted to-9,10-dihydrazine。
Counter-9,10-dihydrothiothio--9,10-dihydrothiothiothioc-9,10-dihydroxythv spin round 11, determining the number of electrons involved in the heat reaction of: (1) h-(2) h+h + ch 3ch 3ch 3+(3) nch 2n+ h 3ch 2ch 2ch 3ch 4(4)+ ncncncncncnncc answer: (1) the number of thiothon electrons involved is six (2) the number of thorium electrons involved is six (4) the number of thallium electrons involved is 16. 12, explaining the following phenomena: (1) in the dels-alder reaction, 2-butyl-butadiene-three-butadiene reaction rate is much faster than 1,3-butadiene。
Answer: in the deers-alder response, 13-butadiene is a diphenylene。
Studies have shown that the energy of the homo orbit can be enhanced when the alkyl is connected to an electronic replacement base。
This brings the homo orbit closer to the lumo energy of the parent alkyl and speeds the reaction。
(2) at this -78o c, the response rate in (b) below is 1,022 times faster than in (a)。
Nnnn+n 2+n 2(a)(b) answer: reaction (a) is a retrogressive reaction from the ring, whereas reaction (b) is a retrogressive reaction from the ring。
According to the front-line orbit theory, thermal reaction of the ring is prohibited and thermal reaction of the ring is permitted。
Thus, reaction (b) at -78°c is much faster than reaction (a)。
(3) the compound ch2 is re-exampled to release large amounts of heat, but it itself is fairly stable。
Answer: the compound ch2 is linear co-polymeric and is not aromatic, and the energy level of molecules is much higher than that of aromatic molecules, so it releases large amounts of thermal energy when re-executed into toluene。
On the other hand, the re-element of the alkyl into toluene is mainly achieved through intra-molecular or considered migration reactions。
Based on the orbital symmetry principle of considering the migration reaction, and the simultaneous migration is impervious to the negative reaction, the heterogeneity migration is limited by the circular structure of the molecule, so that the retraining reaction is highly active and thus the compound ch2 itself is fairly stable。
Iv. Concise (1) orbital symmetry and front-line orbit theory; (2) patterns of electro-cyclic reaction; (3) patterns of ring reaction added; (4) migration response, hydrogen and carbon transport。
Claison's reordering and pope's reordering。
