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I'm not an expert teacher or lecturer of chemistry. I was only a student from SMA NEGERI 15 SURABAYA who had been one of the Bronze Medalist Participants of Olimpiade Sains Nasional X (2011) of Chemistry In Manado, North Sulawesi, 11 - 16 September 2011 and graduated in 2012. Now, I'm studying at Universitas Airlangga in Surabaya, Indonesia. I do love chemistry and I would like to help them who had difficulties in studying chemistry. That's why, please understand me if you found some misconcepts in my entries. Suggestions are always necessary in order to develop this blog. And I'm sorry because my English isn't so well.

All posts are originally created by me. I never stole from any sites or somebody's blog. Although sometimes I took pictures or data from other sites, I always wrote the source of that pictures or data.


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Surabaya, East Java, Indonesia
I born on 1 August 1994 in Pangkalan Bun, a beautiful city in Borneo, Indonesia. I'm studying in 15 Senior High School of Surabaya. And about my blog, please, I'm glad to receive your comments and suggestions that can make my blog becomes better, Thanks. This blog is dedicated for Chemistry, so am I. I hope with chemistry, we'll get a brighter future.

Monday, July 14, 2014

Tundrea - Test Kit Boraks

Kepada para Pembaca Blog Saya, kali ini saya tidak memposting artikel. Saya mencoba untuk menawarkan hasil penelitian saya yang saya komersilkan.

Boraks biasa digunakan secara ilegal sebagai pengenyal pada makanan. Sayangnya, dampak negatif konsumsi boraks berlebih antara lain: Kerusakan Ginjal, Depresi, Muntah Darah, Hingga Kematian.

Tundrea Test Kit Boraks berguna untuk identifikasi kandungan boraks dalam makanan. Bentuk produk ini adalah botol tetes 10 mL yang mengandung larutan yang dapat secara spesifik mengidentifikasi boraks hingga kandungan terkecil 200 ppm. Saya sendiri pernah mencoba identifikasi Satu Butir Garam Boraks dan berhasil teridentifikasi.

Untuk informasi lebih lanjut, silahkan cek: https://www.facebook.com/tundrea.boraks

Saturday, May 31, 2014

Organic Chemistry Problems: Acid-Catalyzed Domino Reactions of Tetraarylbut-2-yne-1,4-diol

A cascade reaction or tandem reaction or domino reaction is a consecutive series of intramolecular organic reactions which often proceed via highly reactive intermedietes. Domino reactions are a powerful tool for the elegant construction of complete molecules from simple substrates with high atom economy.

The reaction of tetraarylbut-2-yne-1,4-diol with electron-rich aromatic compounds at room temperature under p-TsOH catalysis, affords substituted polycyclic aromatic indene derivatives through a domino reaction involving the formation of a cationic allerylium intermediate. Given an organic reaction as follows:


a. Suggest a good synthesis of tetraphenylbut-3-yne-1,4-diol as follows:


b. Propose a mechanism of the acid-catalyzed one-pot synthesis of furans from trisubstituted but-2- yne-1,4-diol as follows:

c. The one-pot synthesis of 1-vinylidenenaphthofurans from tetraarylbut-2-yne-1,4-diol includes Claisen Rearrangement and Enolization Process. Propose a mechanism of the reaction as follows:


d. Propose a mechanism for the formation of 1H-Indene Dye from tetraphenylbut-2-yne-1,4-diol and 1-Naphtol and explain the differences between question c and d.

e. One of the compounds from those reactions above has the following data:

Shift (ppm) of 1H-NMR (400 MHz, CDCl3)
Information
δ 7,59
(d, J = 7-9 Hz, 8H)
δ 7,39-7,23
(m, 12H)
δ 2,86
(s, 2H, -OH)
  

MS Data: Mr = 390,47, Formula: C28H22O2
Predict the structure of that compound and explain your answer.


References:
Wikipedia: Cascade Reaction
http://en.wikipedia.org/wiki/Cascade_reaction

Céu M. Sousa et al. (2014). Acid-Catalyzed Domino Reactions of Tetraarylbut-2-yne-1,4-diols. Synthesis of Conjugated Indenes and Inden-2-ones. J. Org. Chem., Article ASAP.  DOI: 10.1021/jo500907z
http://pubs.acs.org/doi/abs/10.1021/jo500907z