Chapter 144

Look down.

[second question: now we use the cut-off method for inverse synthesis, please give the inverse synthesis analysis]

Li ZHENG'ER is staring.

It's only then that I understand.

It's not a ring.

It's a reverse loop.

Cut the ring.

To cut a complex magic ring into several independent large rings, then cut the big ring into small rings, and so on, until we find enough simple and common starting materials.

Taking cooking as a metaphor, it is equivalent to throwing a good dish to the cook to taste and let him reverse the practice.

Wonderful is wonderful.

But this is already an organic problem at the graduate level.

I don't have to go to the international competition.

Even Li Zheng, who is over prepared, is very flustered in the face of such a magic ring.

Of course, there is much excitement.

If it was Shi Yang, how would he feel about this problem?

When you think about it, this magic ring is really terrible.

But the knowledge of problem-solving did not exceed the outline of the final.

Among them, "organic synthesis - cut-off method" and "organic synthesis route design" are the most important ones. They have also discussed with Shi Yang occasionally before.

In theory, I have all the basic knowledge to understand this problem.

However, in the face of this level of problems, but also too lack of experience and training.

It's like a junior cook apprentice who has mastered all the cooking techniques.

However, it is still too difficult to throw the whole table of Manchu and Han to him, and ask him to push back the practice according to the taste.

Li Zheng subconsciously looks at Zhou Yi on the stage.

Zhou Yi also found him and immediately laughed: "it doesn't matter. If you can't do it, you can come back and listen. The competition in chemistry competition is not as fierce as mathematics and physics, but it's not so easy to win the gold medal."

The team members of the training team were very muddled in the face of Zhou Yi's speech.

What's the matter with mathematical physics competition?

Ou xingzhuo was staring at him and lowering his head.

The fat baby seems to mind brushing the achievement of dragon ball

Should not

He also turned to Li Zheng and felt guilty.

Sorry, friend.

Li Zheng did not say much, and quickly returned to his position.

Instead of sitting down, he picked up his schoolbag.

He took out two empty books and went back to the table all the way.

This is the reaction.

He just came back to get the paper.

In the exclamation, Zhou Yi is not angry, but very excited.

"Good, ambitious!" Zhou Yi clenched the microphone and was impassioned.

"Exactly what I said next - chemistry is like life."

"There's no key that can't be broken. It's just that you and I don't have enough knowledge."

"There's no ring that can't be done, but your and my efforts are not enough."

"Every new response is a new landscape."

"Every intermediate is our dormant process."

"Every process is reversible."

"Only go forward bravely, can we not return to the starting point!"

There is no doubt that the students give applause again.

It's all chicken soup.

But in combination with chemistry.

And suddenly it became demonic.

On the other hand, Li Zheng has no doubt.

It has turned on 112 times of the research speed.

Zhou chenghuan!

Don't blame me for your unkindness.

Obviously, the current experience and knowledge are not enough to break this magic ring.

Then I will try one by one, cutting one key at a time.

Let's fry, cook, stew, stew and stew, one by one.

Use violence against violence.

Key!

……

Half an hour later, Zhou Yi's speech is almost over.

Although Li Zheng didn't hear it, it was really wonderful.

The first half is chicken soup and poisonous chicken soup, which tells us the sweet and bitter of chemistry. With his personal understanding of the ring, the whole process is full of magical literary grace.

In the second half, he explained in detail the selection rules of entering the provincial team and signing a contract with Jida to ensure that each student knew how to achieve his own goal.

From time to time, he glanced at Li Zheng, who was crazy about solving problems. Seeing that Li Zheng was so devoted and did not give up, he was quite appreciative.

It's not just chemistry. It's hard work.

Finally, Zhou Yi even deliberately slowed down his speech in order to give Li Zheng more time.

At this moment, what set the Dragon Ball disorderly parking and so on the mustard, naturally already passed.

This problem has not been studied in a top Chemical Institute for several years. It is impossible to give the inverse synthesis steps.This EUSTAR is a good one, which can make the structure of the ring clear.

Li Zheng's side has long been possessed by demons.

This magic ring has been cut countless times like a kaleidoscope doll.

In his micro world of chemical meditation, he simulated countless possibilities.

The real time is only half an hour.

But now he is 112 times faster.

Plus 100% chemical fanaticism and a 50% bonus from demonic enchantment.

This short half an hour is equivalent to 140 hours of hard work.

Even Li Zheng has never been so bewildered.

Until.

He was staring.

It's done!

Five steps.

Cut 10 keys.

Finally, it broke down into three ghost things.

It is said to be a ghost, but its core is still the ring.

A six membered ring, a five membered ring, and a ternary ring.

Although it is not sure that these three ghost things can be obtained as raw materials.

But every step can work in chemical meditation.

Finally.

There was a snap.

Ring into, write down.

Li zhengtan sat in his chair, as if he had just fought an endless war.

Or had a long dream.

Anyway, at this moment, no matter what the eyes are looking at.

It's all rings.

On the stage, Zhou Yi saw Li Zheng stop writing and also made a final speech to finish.

"Whether it's the training now, or the University in the future."

"Please bear in mind the great housework."

"Any competition is not your internal competition, but your external competition."

"What should really be considered is: how can we be higher than the outside academic level."

"You're better than me, not better."

"Only our whole Chinese chemical collective is strong."

"You are worthy."

"Thank you very much."

Zhou Yi said it and bowed steadily to the students.

All the students stood up and clapped.

For them, this bow is not affordable.

Li Zheng was also separated from the world of the ring.

Isn't that what Zhou Yi said?

In the end, it's all our own people!

Everyone is a ring. Why is it too urgent?

Zhou Yi is also looking at Li Zheng, eyes full of ring smell, quickly step down: "students, wait for two minutes, I'll see how this ring cut."

Li Zheng also got up and took up his answer sheet to meet Zhou Yi. The ring smell in his eyes was no less than that of the president.

"Teacher Zhou, this question is very enjoyable."

Zhou Yi only smiles. He doesn't believe it. This boy must be pretending again.

Until he took the answer sheet.

There are five steps and six graphs. The big ring covers the small ring.

Zhou Yi also had to savor it carefully, muttering at the same time.

"Yes."

"Yes, it's a loop."

"Can it be a ring?"

"It's not a ring?"

"A very imaginative ring."

"Good ring!"

www.novelhall.com , the fastest update of the webnovel!