Introduction to Stereogenic Nitrogen
A close inspection of the pseudoephedrine and ephedrine isomers suggests that other stereogenic center, the nitrogen, is present. As defined before, in shape single-bonded nitrogen is pyramidal, with the non-bonding electron pair pointing to the not occupied corner of a tetrahedral region. Its configuration is chiral because the nitrogen in these compounds is bonded to three distinct groups. The non-identical mirror-image configurations are demonstrated in the picture that is displayed below (the molecule's remainder is represented by R, and the electron pair is represented in yellow color). There would be four additional stereoisomers of pseudoephedrine and ephedrine if these configurations were stable. Though, pyramidal nitrogen is usually not configurationally stable. It fastly inverts its configuration (equilibrium arrows) by passing from a planar, sp2-hybridized transition state, leading to the mixture of interconverting R and S configurations. A 50:50 (racemic) mixture of R and S configurations would present at equilibrium if the nitrogen atom were the only chiral center in the molecule. A mixture of diastereomers will result if another chiral center is present, as in the ephedrin isomers. In any event nitrogen groups like this, if exist in a compound, do not contribute to isolable stereoisomers.
Email based Stoichiometry Homework Help -Assignment Help
Tutors at the www.tutorsglobe.com are committed to provide the best quality Stoichiometry homework help - assignment help. They use their experience, as they have solved thousands of the Stoichiometry assignments, which may help you to solve your complex Stoichiometry homework. You can find solutions for all the topics come under the Stoichiometry. The dedicated tutors provide eminence work on your Organic Chemistry homework help and devoted to provide K-12 level Chemistry to college level chemistry help before the deadline mentioned by the student. Stoichiometry homework help is available here for the students of school, college and university. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
Qualified and Experienced Stoichiometry Tutors at www.tutorsglobe.com
Tutors at the www.tutorsglobe.com take pledge to provide full satisfaction and assurance in Stoichiometry homework help. Students are getting Chemistry homework help services across the globe with 100% satisfaction. We value all our service-users. We provide email based Stoichiometry homework help - assignment help. You can join us to ask queries 24x7 with live, experienced and qualified Chemistry tutors specialized in Stoichiometry.
theory and lecture notes of estimating the population proportion all along with the key concept of estimating the population proportion. tutorsglobe offers homework help, assignment help and tutor’s assistance on estimating the population proportion.
Struggle with Model Theory assignments? Best Model Theory Assignment Help tutors are here to provide A++ papers at feasible prices.
tutorsglobe.com actinide series assignment help-homework help by online f block elements tutors
Presentation of VLF Results tutorial all along with the key concepts of Filtering, Displaying VLF data, VLF/EM comparisons, Natural and controlled-source audio-magnetotellurics, CSAMT practicalities
tutorial all along with the key concepts of Basic Concepts of Magnetic Methods, Theory, Instrumentation, Data Acquisition, Data Processing, Data Interpretation
Profit Sharing and Labour Co-partnership - Workers share in profit might be dealt along with distributed in cash to the workers, credited to the worker's provident fund and pension fund other option is to make a part payment in cash and to credit a part to the provident fund account.
tutorsglobe.com vsb transmission assignment help-homework help by online characteristics of camera tubes tutors
Theoretical Perspectives of motivation tutorial all along with the key concepts of Instinct Theory, Sociobiological Perspective, Drive Theories, Incentive Theory, Maslow's Need Hierarchy, Maslow's Levels, Emotions and Theories of Emotion
tutorsglobe.com donnan equilibrium assignment help-homework help by online passive absorption tutors
tutorsglobe.com haemoglobin assignment help-homework help by online bio coordination compounds tutors
www.tutorsglobe.com offers free assignment help for vogel’s approximation method, unit cost penalty method, operation research subject.
Particle in Three-Dimensional Box tutorial all along with the key concepts of Definition of Particle in a Three-Dimensional Box, Zero point energy
Vegetative Structure of Seed Plants-Leaf tutorial all along with the key concepts of Anatomy of Leaf, Epidermis, Mesophyll, Veins and Leaf morphology
the fourth generation computers uses large scale integrated circuits (lsic) developed a single silicon chip called microprocessors.
tutorsglobe.com methods and tools of financial management assignment help-homework help by online financial management tutors
1963132
Questions Asked
3689
Tutors
1450307
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!