Chapter 143: Yes, this is a loop

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Look down.
[Second Question: Inverse synthesis is now performed using the cut-off method, please give the inverse synthesis analysis]
Li Zheng stared.
Only then can I understand.
This question is not a loop.
Instead, the loop is reversed.
Cut the ring.
It is necessary to cut a very complex magic ring into several independent large rings, and then cut the large ring into small rings, and so on, until you find a sufficiently simple and common starting material.
Taking cooking as a metaphor, it is equivalent to throwing a prepared dish to the chef to taste and let him reverse the practice.
Wonderful is wonderful.
But this is already an organic question at the graduate level.
Icho international competitions may not be so deep.
Even Li Zheng, who was over-prepared, faced such a magic ring.
Of course, the more you panic, the more excited you are.
If it was Shi Yang, how would you feel about this problem?
Think carefully, this magic ring is indeed terrifying.
But the problem-solving knowledge did not exceed the outline of the finals.
Among them, the most critical "organic synthesis-cut-off method" and "organic synthesis route design", I have just nibbled, and occasionally discussed with Shi Yang before.
In theory, he already has all the basic knowledge to understand this question.
However, in the face of this level of questions, I still lack experience and training.
Just like a junior chef apprentice, he has mastered all the cooking techniques.
However, it was still too difficult to throw the full seat of Man Han to him, and let him reverse the practice according to the taste.
Li Zheng subconsciously looked at Zhou Yi on the stage.
Zhou Yi also found him, and immediately smiled: "It doesn't matter, classmates, if you can't do it, you will come back and listen carefully. The competition in the chemistry competition is indeed not as intense as mathematics and physics, but it is not so easy to get a gold award."
Faced with Zhou Yi's remarks, the team members were very stunned.
What about the Mathematics and Physics competition?
Ou Xingzhuo stared at him, lowering his head.
This fat doll seems to really care about the achievement of Dragon Ball......
Wouldn't it...
He also turned to Li Zheng, guilty.
Sorry, friend.
Li Zheng did not talk much, and quickly returned to his place.
However, instead of sitting down, he picked up his schoolbag.
I took two big empty books and came out and went all the way back to the table.
This is how everyone reacted.
He just came back to get scratch paper.
In the exclamation, instead of being angry, Zhou Yi was very excited.
"Okay, have ambitions!" Zhou Yi held the microphone tightly, passionately.
"It's exactly what I want to say next-Chemistry is like life."
"There are no unbroken keys, but you and me are not enough."
"There are no loops that can't be made, but you and me are not hard enough."
"Every new reaction is a new scene."
"Every intermediate is our dormant journey."
"Every process is reversible."
"Only going forward bravely will not return to the starting point!"
The students no doubt applauded again.
Obviously all chicken soup.
But combined with chemistry.
Suddenly it became magical.
On the other side, Li Zheng has no doubt.
The ultimate 112 times speed has been turned on.
Zhou Chenghuan!
You are unkind and blame me for being unrighteous.
Obviously, the current experience and knowledge are not enough to crack this magic ring.
That Lao Tzu tried one by one, cutting key by key.
Let's fry, cook, stew, stew, stew, and cook one by one.
Use violence to control violence.
The key comes!
...
Half an hour later, Zhou Yi's speech was coming to an end.
Although Li Zheng didn't hear it, it was actually very exciting.
The first half is chicken soup and poison chicken soup, telling everyone about the sweetness and bitterness of engaging in chemistry. With his personal understanding of the ring, the magical literacy will rumble throughout the process.
In the second half, he carefully explained the selection rules for signing the provincial team and thistle to ensure that every student knows how to reach his goal.
He glanced at Li Zheng, who was madly solving problems from time to time, and saw Li Zheng so devoted, did not give up, and was quite appreciated.
More than just chemistry, it takes this kind of vigour to do anything.
In the end, Zhou Yi even deliberately slowed down his speech, just to give Li Zheng more time.
At this moment, what mustards like Dragon Ball chaos parking have long passed.
I haven't studied this question for a few years in the top chemical institute, so I would like to give the steps of reverse synthesis.
This Ou Xingzhuo, can make the structure of the ring clear, it is a good kind.
Li Zheng has long been enchanted.
This magic ring has been cut countless times like a kaleidoscope doll.
In the microcosm of his chemical meditation, he simulated countless possibilities.
The actual time is only half an hour.
But now, he is already 112 times faster.
Plus 100% chemical mania, and 50% bonus provided by Earth Demon "Enchantment".
This half an hour is equivalent to 140 hours of rigidity.
Even Li Zheng has never been so devastated.
until.
His eyes glared.
It's done!
Five steps.
Cut 10 keys.
Eventually it was broken into three ghost things.
It is a ghost thing, but its core is still a ring.
A six-membered ring, a five-membered ring, and a three-membered ring.
Although not sure about these three ghost things, they can be obtained as raw materials.
But each step can be established in chemical meditation.
finally.
"Slap".
The ring is formed, and the pen falls.
Li Zheng slumped in his chair, as if he had just fought an endless war.
Or have a hearty long dream.
In short, no matter what the eyes look at this time.
It's all ring.
On the stage, Zhou Yi saw Li Zheng stop writing, and also made a final speech to conclude.
"Whether it is the current training or the future university."
"Please remember."
"Any competition is not your internal competition, but external competition."
"What really should be considered is: how can we achieve a higher academic level than outside."
"You are stronger than me, not stronger."
"Only our entire Chinese chemical collective is stronger."
"You deserve to be strong."
"thank you all."
Zhou Yi said nothing but bowed steadily to the classmates.
All the students stood up consciously and thunderous applause.
For them, this bow is unbearable.
Li Zheng was also separated from the ring world.
Isn’t Zhou Yi what Shi Yang said?
In the end, they are all themselves!
Everyone is a ring, why is this too urgent?
Zhou Yi also looked at Li Zheng, his eyes full of scent, and quickly stepped down: "Students wait two minutes, let me see how this ring cuts."
Li Zheng also got up, picked up his answer sheet and greeted Zhou Yi, the ring in his eyes was no less than that of the dean.
"Ms. Zhou, this question is very enjoyable."
Zhou Yi only smiled, he did not believe it, this kid must be pretending again.
Until he took the answer sheet.
Six pictures in five steps, with big rings and small rings.
Zhou Yi also had to taste it seriously, muttering while tasting.
"can."
"Yes, it's a loop."
"Can this also be looped?"
"Isn't this a loop?"
"Imaginative ring."
"Good ring!"