Alkanes are hydrocarbons. Nomenclature of organic compounds is very important and plays important role in understanding organic chemistry. The link below provide comprehensive detail about how naming alkanes according to IUPAC rules.
Two is better than one : Commercially available ICH2Bpin reacts with readily prepared vinylboron ate complexes under practical conditions to valuable 1,3‐bis‐(boryl)alkanes. The cascade proceeds through two subsequent 1,2‐metallate rearrangements of boronate complexes, with the second boronate being form in the initial 1,2‐migration step.
A general and efficient approach for the preparation of 1,3‐bis‐(boryl)alkanes is introduced. It is shown that readily generated vinylboron ate complexes react with commercially available ICH2Bpin to valuable 1,3‐bis‐(boryl)alkanes. The introduced transformation, which is experimentally easy to conduct, shows broad substrate scope and high functional‐group tolerance. Mechanistic studies reveal that the reaction does not proceed via radical intermediates. Instead, an unprecedented boronic ester induced sequential bis‐1,2‐migration cascade is suggested.
We already have an alkanes thread, but that only counts linear alkanes. Therefore, I had a stupid idea: Why not count and name all branched alkanes? Therefore, in this thread, we'll be counting the preferred IUPAC name of every branched alkane.
Each alkane corresponds to an unrooted tree with certain restrictions. To determine the tree for the Nth alkane, run
treeviz.py with N as a command-line argument and with
trees.txt in the same directory. Note that
treeviz.py requires Matplotlib and NetworkX to run.
trees.txt as given contains the first 18,030 trees; if more are necessary, run
trees.py for yourself.
A online interface for
treeviz.py, created by u/SilverSteeples, can be found at http://cmd.pm/trees; just enter N and press the "Go" button.
The alkane corresponding to each tree can be determined by interpreting each node as a carbon atom.... keep reading on reddit ➡
I completely understand what normal phase chrom is and how polarity relates to the retention time. Just boggled as to why the order of increasing polarity is this way? The ester, having an oxygen AND a C=O should logically be next to a carboxylic acid.... Also why is alcohol between the two?
Journal of the American Chemical SocietyDOI: 10.1021/jacs.0c03821
A general and efficient approach for the preparation of 1,3‐bis‐(boryl)alkanes is introduced. It is shown that readily generated vinylboron ate complexes react with commercially available ICH 2 Bpin to valuable 1,3‐bis‐(boryl)alkanes. The introduced transformation which is experimentally easy to conduct shows broad substrate scope and high functional group tolerance. Mechanistic studies reveal that the reaction does not proceed via radical intermediates. Instead, an unprecedented boronic ester‐induced sequential double 1,2‐migration cascade is suggested.
The development of a predictive model towards site‐selective deprotometalation reactions using TMPZnCl·LiCl is reported (TMP = 2,2,6,6‐tetramethylpiperidinyl). The p K a values of functionalized N ‐, S ‐, and O ‐heterocycles, arenes, alkenes or alkanes were calculated and compared to the experimental deprotonation sites. Large overlap (>80%) between the calculated and empirical deprotonation sites was observed, showing that thermodynamic factors strongly govern the metalation regioselectivity. In the case of olefins, calculated frozen state energies of the deprotonated substrates allowed a more accurate prediction. Additionally, various new N ‐heterocycles were analyzed and the metalation regioselectivities rationalized using the predictive model.
Metalation site prediction : The use of simple pKa calculations allowed a reliable prediction of metalation sites in various heterocycles, arenes, olefins, and alkanes, employing the mild base TMPZnCl⋅LiCl. Using this predictive model, also unexplored N ‐heterocycles were investigated, and the obtained deprotonation sites rationalized readily.
The development of a predictive model towards site‐selective deprotometalation reactions using TMPZnCl⋅LiCl is reported (TMP=2,2,6,6‐tetramethylpiperidinyl). The pKa values of functionalized N ‐, S ‐, and O ‐heterocycles, arenes, alkenes, or alkanes were calculated and compared to the experimental deprotonation sites. Large overlap (>80 %) between the calculated and empirical deprotonation sites was observed, showing that thermodynamic factors strongly govern the metalation regioselectivity. In the case of olefins, calculated frozen state energies of the deprotonated substrates allowed a more accurate prediction. Additi... keep reading on reddit ➡
Sorry if this is ignorant but I recently watched a video on chlorinating molecules using TCCA and they mentioned it acted a lot like NBS. Is it true that they share the same reaction mechanisms? If not is there some information I can find on reactions with TCCA? I wanted to possible make some alkylhalides with it.
People of Reddit!
I have a question concerning the numbering of alkenes in the IUPAC-nomenclature.
If you have just an alkane, you need to take care that the first locant has the lowest possible number.
Now, if you have an alkene, does the double-bond have to have the lowest number or the first locant?
Go buy the stuff now for Shadowkeep!
What is the reaction from A to B and A to D. Is oxidation of alkane possible? I referred to reference books but couldn't find anything on it. If this is very trivial, I will remove it. https://imgur.com/a/Srk9ZQY TIA =)
Aliphatic synthetic intermediates with high added value are generally produced from alkane sources (e.g., petroleum) by inert carbon‐hydrogen (C‐H) bond activation using classical chemical methods (high temperature, rare metals). As an alternative approach for these reactions, alkane monooxygenase from Pseudomonas putida (alkB) is able to catalyze the difficult terminal oxyfunctionalization of alkanes selectively and under mild conditions. Here, we report an electrosynthetic system using an alkB biocathode which produces alcohols, epoxides, and sulfoxides through bioelectrochemical hydroxylation, epoxidation, sulfoxidation, and demethylation. The capacity of the alkB binding pocket to protect internal functional groups, a lucrative capability, is also demonstrated. By coupling our alkB biocathode with a hydrogenase bioanode and using H2 as a clean fuel source, we have developed and characterized a series of enzymatic fuel cells (EFCs) capable of oxyfunctionalization while simultaneousl... keep reading on reddit ➡
Journal of the American Chemical SocietyDOI: 10.1021/jacs.0c01769
Was just wondering how the melting points of alkanes, alkenes and alkynes compare? I've been researching and I've found that the boiling point of alkenes is slightly lower than alkanes (less hydrogens/electrons=less dispersion forces). I also found that alkynes have slightly higher boiling points that alkanes (linear geometry of alkynes = closer packing = stronger dispersion forces). However, I haven't been able to find anything on the internet on melting points? Is it okay to assume that it's the same? i.e. alkenes have lower melting points than alkanes and alkynes have higher melting points than alkanes?
Thank you so much!!